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Home , Catalpa speciosa, Koelreuteria, Pinus edulis, Tree line

TRAIL PLANNING AND IMPLEMENTATION UNIVERSITY OF NORTHERN Chris Simpson UNC Intern, Recreation, Tourism and Hospitality College of Natural and Health Sciences CAMPUS GUIDE 3 TRAIL LOOPS • 106 Brent Engel Tree Campus USA Student Representative, 2012-14 Environmental Studies and Sustainability

Joelle Romero and Gretchen Kershner Map illustrations

Pat McDonald Facilities Management, Manager Landscaping and Grounds

Tree Guide maintenance: UNC Landscaping and Grounds

Guide Produced by: University of Northern Colorado Office of University Relations

Original Supporters: Mackenzie Metcalfe and Sophia Robbins Tree Campus USA Student Representatives, 2013-14

Special Thanks to: Arbor Day Foundation: Tree Campus USA Sponsor

Facilities Management Campus Box 57, Greeley, CO 80639 970-351-2446 unco.edu/treetour UNIVERSITY OF NORTHERN COLORADO CAMPUS TREE GUIDE BY THE NUMBERS the year it’s believed the first tree, possibly Welcome to the University of Northern Colorado campus, recognized an American Elm, was planted on campus as a Tree Campus USA for its commitment to tree preservation, care (It was a gift from the graduating class) and community involvement. 1895 Each day, visitors, students and community members travel the sidewalks of UNC’s landscape and pass by trees that have grown here for decades, sheltering and shading the many who have walked this way before. One silver maple, planted in the early 1900s, has literally grown with the campus, standing sentinel through UNC’s history. 246 ACRES 57 DAYS With nearly 3,400 trees gracing UNC paths, this guide of three of campus canvassed on foot to it took McDonald and Engel to tree tours will help you find and learn about some of the most unique identify and catalog the trees take tree inventory in 2013 growing here. Whether you’re walking the trails beneath the leafy green canopies of summer, the bright shades of autumn, the bare-branched trees of winter or the blossom-laden trees of spring, $19.6 MILLION we hope you’ll enjoy the long-standing and continuing commitment estimated value of campus tree population UNC has for its green spaces, landscapes and natural beauty.

Emerald Ash Borer Threat in Colorado As of 2019, 157 ash trees have been removed on campus due to the threat of Emerald ash borer. The overall goal is to reduce the ash 1,269 trees on campus in 1988 3,695 trees on population to 225 trees. campus as of 2013 4 STATE CHAMPION TREES judged by their size, from the Colorado Tree Coalition: For more information about UNC’s trees, log on to unco.edu/treetour

Amur cork tree Kentucky coffee tree Silver Maple tree tree* TREE GUIDE ICONS *Silver Maple is a former State Champion Tree Tree Shape State Champion Tree Colorado Native Tree Central Campus: Trail of Champions* University Center/Campus Commons Trail 293 34% green ash trees the most of (1,255) are native West Campus Trail any species on campus Colorado species

*UNC’s state champion trees found on this loop

unco.edu/treetour | 1 CENTRAL CAMPUS 27 28 38 TREES • 1 HOUR WALKING TIME 26 TRAIL OF CHAMPIONS 25 24 23 CENTRAL CAMPUS: TRAIL OF CHAMPIONS 22 30 1. Eastern Redbud (Cercis canadensis) 29 Planted 2017 17 * 2. English Oak (Quercus robur) 18* 31 Planted 1996 16 13 14 3. Northern (Catalpa speciosa) 21 ** Planted 1990 N 32 4. Black (Austrian) (Pinus nigra) 20 Planted c. 1913 12 5. Callery Pear ‘Redspire’ 15 33 (Pyrus calleryana ‘Redspire’) Planted 1996 19 6. McIntosh Apple (Malus ‘McIntosh’) 11 Planted c. 1953 7. Hackberry (Celtis occidentalis) Planted c. 1940 UNCCRI 8. Kentucky Coffeetree 34 (Gymnocladus dioicus) Planted c. 1930* 35 9. Horse (Aesculus hippocastananum) 4 Planted c. 1940 10 9 8* 6 1 10. Blue Spruce (Picea pungens) 5 3 Planted c. 1930 7 START HERE 37 36 11. Weeping Norway Spruce 2 38 ( ‘Pendula’) Planted 1994 12. Sugar Maple (Acer saccharum) Planted 2007 13. Littleleaf Linden (Tilia cordata) Planted c. 1975 19. Norway Maple (Acer platanoides) 24. Alpine Fir () 30. American Basswood (Tilia americana) 35. Horse Chestnut ‘Red Flowering’ *State Champion Trees 14. Northern Red Oak (Quercus rubra) Planted 2011 Planted 2013 Planted c. 1930 (Aesculus x carnea ‘Briotii’) **Former State Champion Tree Planted c. 1926 20. Bur Oak (Quercus macrocarpa) 25. Ginnala Maple (Acer ginnala) 31. Pecan (Carya illionensis) Planted 2011 15. European Larch (Larix decidua) Planted c. 1934 Planted c. 1918 Planted c. 1908* 36. Cottonwood (Platanus deltoides) Planted 2018 21. Yellowwood (Cladrastis lutea) 26. Engelmann Spruce (Picea engelmanni) 32. Silver Maple (Acer saccaharinum) Planted c. 1930 16. Tri-Colored Planted 2011 Planted c. 1958 Planted c. 1900** 37. Canada Red Chokecherry

( Roseo-Marginata) 22. Amur Cork Tree 27. Ginkgo () 33. Goldenrain Tree (Koelruteria paniculata) (Prunus virginiana ‘Schubert’) Planted 2005 (Phellodendron amurense) Planted c. 1938 Planted 1998 Planted 1990 17. Black Maple (Acer nigrum) Planted c. 1922* 28. Green Ash (Fraxinus pennsylvanica) 34. Muhgo Pine (Pinus muhgo) 38. American Elm (Ulmus americana) Planted c. 1965 23. White Fir (Abies concolor) Planted c. 1930 Planted c. 1928 Planted c. 1918 18. River Birch (Betula nigra) Planted c. 1968 29. Western Red Birch (Betula occidentalis) Planted 2013 Planted 2000

2 | Campus Tree Guide unco.edu/treetour | 3 ‡ N UNIVERSITY CENTER Candelaria N WEST CAMPUS 32 TREES • 1 HOUR WALKING TIME 36 TREES • 1 HOUR WALKING TIME

19. Thornless Honeylocust ‘Moraine’ (Gleditsia triacanthos inermis ‘Moraine’) Michener Planted c. 1968 20. Littleleaf Linden (Tilia cordata) Planted c. 1973 START HERE 21. Cottonwood (Populus deltoides)

Campus Commons Planted c. 1973 22. Sugar Maple ‘Green ’ (Acer saccharum ‘Green Mountain’) Planted 2010 23. Hackberry (Celtis occidentalis) Planted 2003 START HERE 24. Silver Maple (Acer saccaharinum) Planted c. 1972 25. Green Ash (Fraxinus pennsylvanica) Planted c. 1972 26. American Elm ‘ Forge’ (Ulmus americana ‘Valley Forge’) Planted 2018 27. Kentucky Coffeetree (Gymnocladus dioicus) Planted 2018 28. Muhgo Pine (Pinus muhgo) UNIVERSITY CENTER TRAIL 12. Cherry Plum (Prunus cerasifera) 23. Flowering Crabapple ‘Thunderchild’ Planted 1974 1. Eastern Redbud (Cercis canadensis) Planted c. 1964 (Malus ‘Thunderchild’) 29. Flowering Crabapple ‘Radiant’ Planted 2013 13. Cottonwood (Populus deltoides) Planted 2018 (Malus ‘Radiant’) Planted c. 1965 24. Northern Red Oak (Quercus rubra) 2. White Fir (Abies concolor) Planted 2012 Planted 1964 14. Blue Spruce (Picea pungens) Planted 2018 WEST CAMPUS TRAIL 10. Columnar European Hornbeam 30. Japanese Tree Lilac ‘Ivory Silk’ Planted c. 1964 25. Flowering Crabapple ‘Prairifire’ 1. Gambel Oak (Quercus gambelii) (Carpinus betulus ‘Fastigiata’) 3. Bur Oak (Quercus macrocarpa) (Syringa reticulata ‘Ivory Silk’) (Malus ‘Prairifire’) Planted 2001 Planted 2010 Planted 1964 15. Pecan Hickory (Carya illinoinensis) Planted 2012 Planted c. 1964 Planted 2018 2. Horse Chestnut, Red (Aesculus x carnea) 11. White Pine (Pinus strobus) – Planted 2009 4. Kentucky Coffeetree (Gymnocladus dioicus) 31. Buckthorn (Rhamnus cathartica) 26. Flowering Crabapple ‘Red Baron’ Planted 2001 12. Eastern Redbud (Cercis canadensis) Planted 1964 16. Thornless Honey Locust ‘Moraine’ Planted 1973 (Gleditsia triacanthos inermis ‘Moraine’) (Malus ‘Red Baron’) 3. Limber Pine () Planted 2017 5. American Sycamore (Platanus occidentalis) 32. Ponderosa Pine (Pinus ponderosa) Planted c. 1964 Planted 2018 Planted 2001 13. Blue Spruce (Picea pungens) Planted c. 1964 Planted c. 1969 17. Downy Hawthorn (Crataegus mollis) 27. Horse Chestnut ‘Red Flowering’ 4. Red Maple ‘Autumn Blaze’ Planted 1984 6. Scots Pine (Pinus sylvestris) 33. Red Maple ‘Armstrong’ Planted 1964 Planted c. 1964 (Aesculus x carnea ‘Briotii’) (Acer x freemanii ‘Autumn Blaze’) 14. Greenspire Linden (Tilia cordata ‘Greenspire’) Planted 2018 Planted 2001 Planted 2018 (Acer rubrum ‘Armstrong’) 7. Flowering Crabapple ‘Eleyi’ (Malus ‘Eleyi’) 18. Goldenrain Tree () Planted 2012 Planted c. 1964 Planted c. 1964 28. Flowering Crabapple ‘Spring Snow’ 5. White Fir (Abies concolor) 15. American ‘Liberty’ Elm (Malus ‘Spring Snow’) Planted 2001 (Ulmus americana ‘American Liberty’) 34. Ginkgo (Ginkgo biloba) 8. Black (Austrian) Pine 19. White Oak (Quercus bicolor) (Pinus nigra) Planted 2018 Planted 2008 Planted 1990 Planted c. 1964 Planted c. 1964 6. Japanese Tree Lilac (Syringa reticulata) 29. Ginkgo (Gingko biloba) Planted 1984 16. Red Sunset Maple (Acer rubrum) 35. Lodgepole Pine (Pinus contorta) 9. Engelmann Spruce 20. (Pinus edulis) () Planted 2018 Planted 2009 Planted 1989 Planted c. 1964 Planted c. 1964 7. Northern Catalpa (Catalpa speciosa) 30. () Planted 2003 17. Russian Hawthorn (Crataegus ambigua) 36. Flowering Crabapple ‘Spring Snow’ 10. Japanese Weeping Cherry Tree 21. Greenspire Linden (Tilia cordata ‘Greenspire’) (Malus x ‘Spring Snow’) Planted 2018 8. Green Ash ‘Marshall’s Seedless’ Planted 2001 (Prunus subhurtilla ‘Pendula’) Planted 2018 Planted 2003 Planted 2012 22. Mountain Frost Pear 31. Northern Catalpa (Catalpa speciosa) (Fraxinus pennsylvanica ‘Marshall’s Seedless’) 18. London Plane Tree ‘Bloodgood’ Planted 2018 Planted 2003 (Platanus x acerfolia ‘Bloodgood’) 11. Japanese Pagoda Tree (Pyrus ussuriensis ‘Mountain Frost’) 32. American Basswood Planted 2009 (Styphnolobium japonicum) Planted 2018 (Tilia americana) 9. Washington Hawthorn (Crataegus phaenopyrum) Planted 2004 Planted c. 1964 Planted 2003

4 | Campus Tree Guide unco.edu/treetour | 5 Tree Leaf Shape Central Campus: Trail of Champions State Champion Tree University Center Trail TREE DESCRIPTIONS Colorado Native Tree West Campus Trail Callery Pear ‘Redspire’ Cottonwood English Oak 3 TRAIL LOOPS • 110 TREES (Pyrus calleryana ‘Redspire’) (Populus deltoides) (Quercus robur) ‘Redspire’ is an attractive Callery pear cultivar. One of a number of native trees on campus, A long-lived tree, Its large showy blossoms are larger than other cottonwoods grow quickly. The serve the English oak has a ornamental pear and a dramatic snowy as food for various types of caterpillars. Tree large wide-spreading Alpine Fir American Sycamore Blue Spruce white. New leaves grow in a deep purple. They 36 is the second-largest tree on campus and crown of rugged (Abies lasiocarpa) (Platanus occidentalis) (Picea pungens) mature to glossy green with a hint of red, then is nearly 90 years old. Cottonwoods (with their branches. While it may This is one of several tree varieties planted to Paleobotanists have When the Colorado Horticultural Society gave light up your garden in the autumn as they turn cottony -borne ) are no longer planted naturally live to an age of a help complete UNC’s Colorado native collection. dated sycamore Colorado schoolchildren the chance to vote on yellow, purple and crimson. on campus due to their suckering tendency and few centuries, many of the Known as the alpine fir or Rocky Mountain fir, trees as far back a tree to represent the state, they chose the susceptibility to storm damage. oldest trees are pollarded or it’s commonly found at and immediately below as 100 million blue spruce. There are 267 blue spruce trees on coppiced — pruning techniques that extend the the tree line. Some Plateau Indian tribes drank years. An campus. Growing to 49 feet tall by 16 feet wide, Canada Red Chokecherry tree’s potential lifespan and health. Planted for or washed in a subalpine fir boil for purification American this conical evergreen has scaly grey (Prunus virginiana ‘Schubert’) Downy Hawthorn forestry and its desirable, durable heartwood, or to make their hair grow. sycamore tree bark and waxy blue to grey-green leaves. The Canada red chokecherry is a pyramidal tree that (Crataegus mollis) English oaks were made famous as the tree of can often be easily Navajo and Keres Native Americans used this as grows 20 to 30 feet in height, or as a shrub. It This tree is popular for its white flowers, which choice by Robin Hood in Sherwood . distinguished from other trees by its mottled, a traditional medicinal and ceremonial item. has moderate water needs and prefers full sun are borne in clusters at the end of the branches American Basswood exfoliating bark which flakes off in great and well-drained soil. The , while astringent, in spring. The bright red edible fruit ripens in (Tilia americana) irregular masses, leaving the surface mottled can be used to make jellies. Suckering tends late summer and early fall and falls soon after. European Larch to be a problem with this species and tent This species is a target of gypsy moths, and leaf Also known as lindens, and greenish-white, gray and brown (earning Bristlecone Pine (Larix decidua) both of these trees are excellent specimens. sycamores the name “ghost trees.”) This is the (Pinus aristata) caterpillars love this tree. rusts and fire blight are among the many foliage European larch is a great choice for specimen Honeybees love the blossoms as a nectar only American sycamore on campus. Bristlecone are the oldest single living diseases to affect this species. The sharp thorns plantings or in groups for parks and large areas. source, and in early fall the abundant seeds organisms known (though some form are a hazard. Unlike most , it drops its needles in winter. twirl in the air as they fall. A terrific shade clonal colonies which may be many times older). Cherry Plum Bright green foliage in spring changes to medium tree that is relatively problem free, there are Amur Cork Tree The oldest bristlecone pines are single plants that (Prunus cerasifera) green throughout summer, turning a golden yellow 51 American basswood trees on campus. (Phellodendron amurense) have been alive for a little less than 5,000 years. The cherry plum is native to Europe and Asia. Eastern Redbud in fall. It is very cold-tolerant, able to survive Tree 30 on the Central Campus loop is nearly This tree is native to northern China and These very old trees are of great importance in Among the first European trees to in (Cercis canadensis) winter temperatures down to at least -50 °C, 90 years old. Manchuria, and known for its picturesque side dendrochronology or tree-ring dating. spring, cherry plums often start budding in A flamboyant spring show-off, this large and is among the tree-line trees in the . branching, which adds all-season landscape mid-February. The flowers are white with five shrub or small tree is native to interest. This state champion tree is the largest petals. Like peaches, cherries and plums, the eastern North America. In the wild, eastern American Elm amur cork tree in Colorado. Buckthorn edible fruit is called a “.” It’s yellow or red redbud is a frequent native understory tree. Flowering Crabapple ‘Prairiefire’ in color, reaching maturity from early July to Its flowers — light to dark magenta pink (Ulmus americana, ‘Libertas,’ and ‘Valley Forge’) (Rhamnus cathartica) (Malus ‘Prairiefire’) This tree lined most American city streets by Buckthorns are a deciduous shrub or small tree, mid-September. clusters — appear from spring to early summer. Beautiful reddish-magenta blossoms cover an 1900. The arrival of Dutch elm disease in the Black (Austrian) Pine with gray-brown bark and spiny branches. The upright, spreading tree in spring followed by 1960s was devastating, and this tree largely (Pinus nigra) leaves are elliptic to oval, and green, turning maroon, cone-shaped fruit. This cultivar is fairly disappeared from urban American landscapes. Most university campuses across the nation can yellow in autumn. The insect-pollinated flowers Columnar European Hornbeam Engelmann Spruce disease-resistant and the showy, bright red On Central Campus, tree 38 is the largest elm lay claim to this popular ornamental. It does have are yellowish-green, with four petals, and the (Carpinus betulus ‘Fastigiata’) (Picea engelmannii) berries provide a good winter food source on campus; on West Campus loop for tree 15, a few shortcomings, including susceptibility to fruit is a black drupe, containing two to four This dense, conical Also called white spruce, mountain spruce or for birds. which is a nice example of the elm cultivar the disease Diplodia Tip Blight in moister, more seeds. It’s mildly poisonous for people, but shaped tree has silver spruce, this species of spruce is native ‘American Liberty,’ named after the famed humid climates. Tree 4 is one of our campus readily eaten by birds, which disperse the seeds attractive gray bark to western North America, and mostly a high “Liberty Tree” which was an elm that stood in giants on the Central Campus loop and is over in their droppings. and oblong, deeply altitude mountain tree, growing at altitudes of Flowering Crabapple ‘Eleyi’ ribbed, dark green Boston during the American Revolution. Tree 26 100 years old. 2,952 to 11,975 feet. This tree can reach heights (Malus purpurea ‘Eleyi’) is the elm cultivar ‘Valley Forge’ the most Dutch leaves that turn of 125 feet and is often found growing with blue Raised and named before 1920 for Charles Elm Disease-resistant variety tolerant of de-icing Bur Oak golden yellow in spruces and ponderosa pines. Eley of Suffolk, England, this tree has dark red salts and air pollution. Black Maple (Quercus macrocarpa) the fall. Catkins flowers, dark purple foliage and purple fruit. It’s emerge with the leaves (Acer nigrum) The bur oak is a drought- and pollution-tolerant a very common crabapple tree and was prevalent The black maple is closely related to the sugar tree. A slow growing tree that stands the test of to produce long papery in the 1960s. This is a heirloom crabapple and maple and identification can be confusing due time, bur oaks commonly live to be 200 to 300 in late summer. no longer readily available. These trees were to the two species’ tendency to form hybrids. years old, and some may live up to 400 years. They tolerate most soils, planted in 1964-65 after the construction of the The black maple’s geographic range is slightly Many of UNC’s older giant silver maple and green transplant well and seldom University Center. more limited than the sugar maple, and it ashes are being replaced with these mighty show any dieback from stress. encompasses much of the Midwest and portions oaks.Tree 20 on the Central Campus loop is of the eastern . more than 80 years old.

6 | Campus Tree Guide unco.edu/treetour | 7 Central Campus loop is more than 90 years old. in Germany before 1820. The hybrid grows humans and pets. It’s a very good shade tree

Tree 8 on the West Campus loop is a green ash between 67 and 83 feet tall, intermediate and generally problem free. Tree 8 on the Central Flowering Crabapple ‘Radiant’ Ginkgo London Planetree ‘Bloodgood’ of the cultivar ‘Marshall’s Seedless.’ between the parent species in most respects, Campus loop is the largest Kentucky coffeetree (Malus ‘Radiant’) (Ginkgo biloba) (Platanus x acerfolia ‘Bloodgood’) but inheriting the red flower color from the red on campus and is a state champion. A ‘Radiant’ crabapple, also called a flowering The ginkgo is a This is one of the first cultivars to be selected buckeye. It’s a popular tree in large gardens and crabapple, is of the Malus species and is related unique species of tree for anthracnose resistance. A rounded tree with parks. Trees 35 on the Central Campus loop, to common variety apple trees. Any type of with no close living relatives. Greenspire Linden deep green leaves, ‘Bloodgood’ tolerates poor and 2 on the West Campus loop are the ‘Briotii’ crabapple tree, in comparison with an apple tree, Often referred to as the (Tilia cordata ‘Greensprie’) Limber Pine cultural conditions, including heat, drought cultivar. is smaller in all respects. ‘Radiant,’ known as the “living fossil tree,” fossils One of 115 trees planted upon the construction (Pinus flexilis) and poor soil. Recent observations indicate “jewel of the landscape” because it produces of ginkgo leaves date of the Campus Commons Building. Greenspire The limber pine is popular as a windbreak susceptibility to ozone.

flowers, often serves an ornamental purpose back about 270 million linden is a magnificent shade tree with a strong, tree or an ornamental tree due to its drought spire-like shape throughout its life and fragrant Japanese Tree Lilac and bears edible fruit. years, and this tree tolerance. It’s also grown as a , yellow flowers in early summer when few trees (Syringa reticulata) was considered extinct with soft needles but with stiffer branches than McIntosh Apple Trees bloom. It is very tidy and low-maintenance, The Japanese tree lilac is native to eastern Asia. until 1691. Native to China, the tree is widely an eastern white pine. These trees are typically (Malus ‘McIntosh’) It is a deciduous small tree, growing to a height Flowering Crabapple ‘Red Baron’ cultivated and was introduced early to human adaptable, and makes an excellent lawn or street high elevation pines, marking the tree line in Although not a desirable ornamental tree for a specimen, or by a pool or deck. It has dark green of up to 45 feet, with a trunk up to a foot in (Malus ‘Red Baron’) history. It has various uses in traditional medicine subalpine areas, and they are known for their university campus due to the apple drop and its diameter. The largest species of lilac, it’s the only A beautiful accent tree covered in abundant and as a food. Tree 27 on the Central Campus foliage throughout the season. The heart-shaped long lifespans. A limber pine in Oregon’s Eagle respective mess, these two apple trees produce one that regularly grows as a small tree rather deep red flowers in spring followed by persistent loop is more than 80 years old. leaves turn an outstanding gold in the fall. Cap Wilderness has been documented as more a very desirable eating and baking apple, much than as a shrub. Tree 30 on the West Campus deep red fruit and brilliant orange leaves in fall, than 2,000 years old. to the delight of the resident squirrels. loop is the cultivar ‘Ivory Silk.’ its distinctive narrowly upright form is ideal for smaller landscapes; needs well-drained soil and Ginnala Maple Hackberry

full sun. (Acer ginnala) (Celtis occidentalis) Littleleaf Linden Mountain Frost Pear The common hackberry is Japanese Pagoda Tree Tree 25 on the Central Campus loop is the (Tilia cordata) (Pyrus ussuriensis ‘Mountain Frost’) (Styphnolobium japonicum) largest Ginnala maple on campus and more than easily distinguished from Littleleaf lindens are Mountain Frost Pear is blanketed in stunning Commonly called Japanese Pagoda Tree or Flowering Crabapple ‘Spring Snow’ 100 years old. This tree is native to northeastern elms and some other widely grown as clusters of white flowers with purple anthers hackberries by its cork- Chinese Scholar Tree, is native to China and (Malus ‘Spring Snow’) Asia, from easternmost Mongolia to Korea and ornamental trees along the branches in mid-spring, which emerge Korea, but not Japan. It is a medium to large The ‘Spring Snow’ flowering crabapple tree is Japan, and north to southeastern in the like bark with wart-like throughout their from distinctive shell pink flower buds. It has deciduous tree that typically matures to 50 feet loaded with white flowers in early spring. Mature Amur River valley. It is a small maple that leafs protuberances. native range in dark green foliage throughout the season. The to 75 feet (less frequently to 110 feet) tall with a trees reach a height of 20 feet with a spread of out early in the spring and is sometimes grown The leaves are Europe. In the 17th glossy oval leaves turn an outstanding burgundy broad, rounded crown. It is generally cultivated 10 feet. The tree is almost sterile with negligible as a garden subject or boulevard tree. asymmetrical and 18th centuries, in the fall. The fruits are showy yellow pomes for its attractive compound foliage and fragrant fruit production. It has recently become a very and coarse- littleleaf linden was displayed in early fall. late summer flowers. Planted by the Japanese popular ornamental tree in Colorado. textured. The frequently planted to form hackberry produces Culture and Aname Club. avenues, and Sarajevo’s Goldenrain Tree small berries that turn streets used to be lined with Muhgo Pine (Koelreuteria paniculata) orange-red to dark purple in the autumn, Flowering Crabapple ‘Thunderchild’ them. While many communities plant linden trees () This small to medium-sized deciduous tree often staying on the trees for several months. Japanese Weeping Cherry Tree (Malus ‘Thunderchild’) along streets due to its rapid growth rate and Muhgo Pine 34 on the Central Campus loop reaches heights of about 23 feet, with a broad, (Prunus subhurtella ‘Pendula’) Rapidly becoming one of the most popular dense, symmetrical crown, littleleaf linden is is more than 90 years old and our largest dome-shaped crown. The flowers are yellow, Japanese weeping cherry trees are popular landscape ornamentals, the ‘Thunderchild’ has sensitive to road salt. Honeybees love this tree specimen of this multi-stemmed pine. This tree with four petals, growing in dramatic, large ornamental trees because of the profusion of fragrant lavender flowers with pink overtones Horse Chestnut as a nectar source. was damaged by a snowstorm in October 2011. terminal panicles 8 to 16 inches long. The fruit blooms that appear in the spring. They belong to in spring, and attractive deep purple foliage (Aesculus hippocastanum) Muhgo pines are popular ornamentals originating is a three-parted inflated bladder-like pod, first one of the largest families of plants, Rosaceae, all season long. The small ruby-red fruit are This tree is native to the Balkan region and has from the of southern Europe, with green, then ripening orange-to-pink in autumn, which also includes roses, blackbrush, attractive to birds. large white flowering panicles. There are many Lodgepole Pine extremely resilient branches that can typically and containing several dark brown to black thornapples, hawthorns, flowering quince, cultivars developed from this species and the (Pinus contorta) withstand large amounts of wet snow. The seeds. blackberry and raspberry. red-flowering varieties are very popular in the Lodgepole pines (so named because Native extraordinarily heavy 2011 snowstorm proved landscape. This tree is subject to drought injury Americans used this species when building tipis to be beyond this tree’s limits. Gambel Oak and leaf scorch. After the leaves fall, leaf scars and lodges) are known to reach heights of up Green Ash (Quercus gambelii) on the tree have a distinct horseshoe shape with Kentucky Coffeetree to 160 feet, with a diameter of up to 7 feet. The (Fraxinus pennsylvanica, ‘Marshall’s Seedless’) Named after the American naturalist William seven “nail holes.” (Gymnocladus dioicus) lodgepole pine, as a species, is very dependent This is the most abundant tree planted on Gambel (1823–1849), there are some 54 of Pioneers used the coarse-grained in on fire as a mode of replacing itself. The bark campus. Of the 20 largest trees on campus, these trees on campus. Although its wood is cabinetry and roasted the Kentucky coffeetree’s of the lodgepole pine is fairly thin, minimizing six of them are green ash. It is a hardy tree hard and dense, its branches are irregular and Horse Chestnut, Red Flowering seeds to use as a coffee substitute. The “coffee” the defense the tree has to fire. The stands are and at maturity becomes an impressive shade crooked, making them flexible enough to bend (Aesculus x carnea, ‘Briotii’) name is in reference to the dark coffee-colored so densely populated that the trees self thin, or and street tree. The autumn-colored leaves are without breaking when covered with heavy snow. This tree is an artificial hybrid between a that is found in its pod. The leaves, seeds out-compete each other, leaving dead trees in brilliant gold-yellow, and very striking. Gibson, The bark is rough and brownish-gray. The leaves red buckeye and a horse chestnut. Its origin and pulp are poisonous and toxic to livestock, the stand. Fender and Ibanez guitar companies use green are generally 3 to 5 inches long, turning orange is unknown, but it probably first appeared and yellow during autumn. ash wood for their guitars. Tree 28 on the

8 | Campus Tree Guide unco.edu/treetour | 9 is more adaptable to the moister climates of

the southern United States, and it is one of Northern Catalpa Red Sunset Maple Silver Maple Thornless Honey Locust ‘Moraine’ White Fir Colorado’s most unique trees. (Catalpa speciosa) (Acer rubrum ‘Franksred’) (Acer saccaharinum) (Gleditsia triacanthos inermis ‘Moraine’) (Abies concolor) The northern catalpa Red sunset maple has strong wood and is a Valued at more than These tough, fast-growing trees tolerate White fir is native to the mountains of western

is a medium-sized vigorous, fast-grower, reaching a height of 50 $97,000, this former flooding, seasonal extremes, acidic and alkaline North America, found at elevations of 2,952 to Pinyon Pine tree with brown to gray feet with a spread of 25 to 35 feet. This tree state champion is the soils, highway salts and city pollution. They 11,154 feet. This medium-to-large evergreen (Pinus edulis) bark. The leaves are is preferred over red maple, silver maple or oldest and largest also resist wind damage and tolerate drought coniferous tree can reach heights of nearly 200 The Pinyon (piñon) pine grows as the dominant large, heart-shaped boxelder when a fast-growing maple is needed. tree on campus. The once established. Their long narrow pods have feet. Popular as an ornamental landscaping tree species on 4.8 million acres in Colorado, making and pointed at the The newly emerging red flowers and fruits signal species was commonly a sweet gummy sap which inspires the common and Christmas tree, the white fir species offers up 22 percent of the state’s . The pinyon tip, and the trumpet- that spring has come. Leaves retain an attractive planted in the Greeley region name, honey locust. Their roots can break a perfect combination of strength, versatility pine has close ties to agriculture, as strong, shaped flowers are white with yellow stripes and high gloss throughout the growing season, around 1900. Because of its massive water pavement — problematic when planted close to and beauty. pinyon wood “plow heads” were used to break purple spots inside. The leaves generally don’t and the fall show is breathtaking, with red and needs it’s now a prohibited tree. Prone to storm a road or sidewalk. soil for crop planting at the state’s earliest known color in autumn before falling and instead either orange leaves blending to give a sunset effect. damage, silver maples also have a very shallow agricultural settlements. fall abruptly after the first hard freeze, or turn a The seeds of Red Sunset Maple are quite popular root system that makes mowing a challenge. White Pine slightly yellow-brown before dropping off. Widely with squirrels and birds. Tri-Colored Beech (Pinus strobus)

planted as an ornamental tree, prefers (Fagus sylvatica ‘Roseo-Marginata’) White pines prefer well-drained soil and cool, Ponderosa Pine moist, high pH (alkaline) soil and full sun, but will Sugar Maple The tri-colored beech tree, is a lesser-known humid climates, but can also grow in boggy grow almost anywhere in North America. (Pinus ponderosa) River Birch variety of beech tree but can be a better choice areas and rocky highlands. In mixed forests, The bark on ponderosa pines helps to distinguish (Acer saccharum) (Betula nigra) for a small yard than the other , which this dominant tree towers over all others, it from other species. Mature specimens have This maple tree — known for its sugary sap River birch is native to the eastern U.S., and can often grow quite large. Many shades of pink, including the large, broadleaf hardwoods. It cinnamon-red bark with black crevices and used to produce maple syrup — isn’t common while it’s commonly found in flood plains or green and gray can be seen on this tree’s leaves. provides food and shelter for numerous forest Northern Red Oak younger trees have black to reddish-brown on campus and efforts are being made to plant , this tree will also grow on higher birds, such as the Red Crossbill, and small (Quercus rubra) bark. The tree can often be identified by its more of this species. It takes about 40 gallons land. Its bark is distinctive, making it a favored mammals, such as squirrels. The northern red oak is one of North America’s characteristic long needles that grow in tufts of of sap-water to produce one quart of syrup. This most important oaks for timber production. ornamental tree for landscape use. Native tree is also famous for its brilliant gold, orange Washington Hawthorn two to four (or five) depending on subspecies. Americans used the boiled sap as a sweetener (Crataegus phaenopyrum) Quality red oak is of high value as lumber and Opinions differ on the scent. Some state that it and orange-red fall colors. veneer. Northern red oak is easy to recognize by similar to maple syrup, and the inner bark as a Widely grown as an ornamental, Washington Yellowwood has no distinctive scent while other sources note survival food. hawthorns reach up to 33 feet in height. The its bark, which features bark ridges that appear that the bark’s furrow smells like vanilla. (Cladrastis lutea) to have shiny stripes down the center. A few other Sugar Maple ‘Green Mountain’ small, red, berry-like fruit grow closely together Native to eastern U.S. forests, this tree is in large clusters and are food for squirrels widely grown as an ornamental tree oaks have similar bark in the upper tree but the (Acer saccharum ‘Green Mountain’) Russian Hawthorn and birds. They have a mild flavor and can be for its attractive, fragrant flowers. It northern red oak is the only tree with the striping Red Maple ‘Armstrong’ The Green Mountain sugar maple has all of all the way down the trunk. Tree 14 on the (Crataegus ambigua) eaten raw or cooked. As with other species of draws its name from the color of (Acer rubrum ‘Armstrong’) the sugar maple’s positive characteristics (like The Russian hawthorn is a species of thorn hawthorn, the wood is hard and can be used to its heartwood, thrives in full Central Campus loop is more than 90 years old. This fast growing, upright tree becomes 50 to 75 strong limbs and gorgeous fall color) but the (hawthorn) native to Western Asia and Eastern make tools. sunlight and in well- feet tall and retains a narrow form. New foliage seeds are inconspicuous for less mess. That no- Europe, including Armenia, Iran, Russia and drained soil emerges vibrant red and turns dark green in fuss characteristic makes the Green Mountain Turkey. It grows as a shrub or tree up to about and tolerates Norway Maple the summer. Fall color is usually orange-red to sugar maple a good choice for wide lawns, 35 feet in height. The fruit is dark red to purple Weeping Norway Spruce high pH soils (Acer platanoides) yellow-orange (in warmer climates) but not as screens, and shade and as a specimen tree. It’s This maple is native to Europe and many or black, with one or two stones, and the bark’s also a good, durable street tree, and the leathery (Picea abies ‘Pendula’) as well as acidic brilliant as other varieties. It has smooth, silver- This is another “one-of-a-kind” specimen on cultivars exist from this species. Many purple- characteristic gold–bronze color provides leaves are heat- and drought-resistant. situations. The gray bark that becomes deeply ridged with age. campus. Saved from construction and replanted leaved maples are Norway maple cultivars. Very winter-interest. yellowwood can Showy red flowers precede foliage on intriguing at this site in 1994, this tree is one of many thick canopies make them excellent shade trees. withstand urban settings reddish branches. This tree is native to the cultivars of the Norway spruce tree. It’s normally They are susceptible to a soil-borne virus called Swamp White Oak and is attractive to birds. eastern U.S. a very large tree with pendulous branches that verticillium wilt. Scots Pine (Quercus bicolor) (Pinus sylvestris) have a curtain-like growth habit. The swamp white oak is a medium-sized tree of This species of pine is native America’s north central and northeastern mixed Red Maple ‘Autumn Blaze’ Pecan Hickory to Europe and Asia. It has forests. It has a very large range and can survive (Acer x freemanii ‘Autumn Blaze’) orange-colored bark and Western Red Birch (Carya illinoinensis) Autumn Blaze is the fastest growing maple tree, in a variety of habitats. It grows rapidly and is Pecan tree 31 on Central Campus loop is is often used in the long-lived, reaching 300 to 350 years in age. It’s (Betula occidentalis) prized for its hardy nature and brilliant color. Water birch, also known as red birch, is native more than 110 years old, and this tree is under Christmas tree industry. not a large tree, typically about 65 to 80 feet tall, This tree will turn blazing red during the autumn to western North America. It typically grows consideration for state champion status by The species can live up with the tallest known reaching 95 feet. months, adding to the campus’ changing fall along streams in mountainous regions, and is a the Colorado Tree Coalition. Since Colorado’s to 300 years. landscape. This tree’s bark always has dark deciduous shrub or small tree growing to 35 feet dry climate doesn’t allow the to fully striping on its gray-silver surface. high, usually with multiple trunks. The smooth develop, a harvest is unlikely. This tree bark is dark red-brown to blackish.

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