Insert as an Additional Taxa For Eucalyptus spp.: Eucalyptus camaldulensis F. Dehnhardt River Red Gum (Eucalyptus rostrata) C This species is also known as Eucalypto Rojo or Murray Red Gum; Eucalyptus camaldulensis is a large evergreen tree which can grow to 150N tall in its native land; trees seldom reach half this size in our region; limbs are thick, stout, and sort of twisted; the red-brown twigs have gray- green leaves; white ball-shaped flowers bloom in spring to early summer followed by top-shaped capsules containing the tiny seeds; the bark is smooth with shredding gray to red-brown strips. C Trees are hardy in USDA zones 9 to 11; plants are adapted to sunny locations with dry, or temporarily wet, well drained soils of various fertility levels; plants are however prone to chlorosis on high pH soils; one consideration when planting this species is the cost of removing cold damaged limbs or even whole trees; this can be expensive given its large size. C This is one of the most widely distributed species of Eucalyptus in its native Australia; the specific epithet refers to this species early cultivation in the Camaldoli Garden in Naples, Italy, after its introduction to Europe; in addition to park or street tree plantings, it is sometimes used as a honey tree by bee keepers. C Friend (1942) recommended Eucalyptus × algeriensis L.C. Trabut, the Aglerian Eucalyptus, for use in the Rio Grande Valley based on his trials at the Weslaco station in the 1930s; which is either a hybrid between E. camaldulensis × E. viminalis or E. camaldulensis × Eucalyptus rudis S.F.L. Endlicher (Desert Gum); it resembles E. camaldulensis in most respects. Eucalyptus microtheca F.J.H. von Mueller Tiny-Capsule Eucalyptus C This species is also known as Coolibah or Flooded Box Tree; Eucalyptus microtheca is a popular small to medium size, 30N to 40N tall, tree for the arid southwestern landscapes; younger trees have white bark that later matures to a gray-brown color; trees may have a single leaning or multiple trunks and develop irregular open canopies of green to silver-gray 5O to 8O long lanceolate or narrow sickle-shaped leaves. C This Australian native is adapted to arid landscapes in USDA zones 9(8) to 11; it is valued for its tolerance to high pH soils, salty irrigation water, heat and drought; it is also valued for its ability to tolerate irrigation sufficient to grow turfgrasses, which is sometimes a problem for arid region trees; Eucalyptus microtheca makes a handsome specimen, but is probably shown to its best advantage in groves; nothing like a good rest under a Coolibah tree, right mate?; other species are probably better adapted for use in mesic climates. Eucalyptus nicholii J.H. Maiden & W.F. Blakely Willow-Leaved Peppermint C This species is also known as Narrow-Leaved Black Peppermint; this small to medium size tree can reach 40N in height in its native habitat, but is smaller in our region; trees have a fairly narrow upright crown of blue-green leaves that resemble those of willow (Salix spp.) in shape; the bark is rougher and darker than most gum types and exfoliates in thin stringy strips; this species is not as showy as some of the gum type Eucalyptus, but it also is also not as prone to overgrow the site. C Most references list this Australian species as hardy in USDA zones 9 to 11, but I have grown it successfully in College Station, Texas, for over 10 years where it has tolerated temperatures down to about 15NF when sited on a well-drained slightly alkaline soil with occasional irrigation with salty alkaline water. Eucalyptus urnigera J.D. Hooker Urn-Fruited Gum C Eucalyptus urnigera is also known as Urn Gum; Urn-fruited Gum is so named due to the shape of the fruit capsules and the specific epithet means urn bearing; potentially a large tree under favorable conditions, E. urnigera develops a thick trunk with whitish underbark and exfoliating brown to tan patches; the pendulous limbs bear leaves that are broadly sickle-shaped with a blue-green coloration. C This Tasmanian native is hardy in USDA zones 9 to 11; according to several authorities it is one of the better species for use in the Deep South. Eucalyptus viminalis J.H. de La Billardière Manna-Gum (Eucalyptus huberana) C This species is also known as Manna-Gum Eucalyptus or Ribbon Gum; Eucalyptus viminalis is a tall tree with drooping pendulous branches covered in narrow leaves; trunks have a smooth white to yellowish white underbark that turns brown and exfoliates in long ribbon-like strips as it ages; the specific epithet means with osier-like shoots. C Plants of this species are better adapted to our region than most Eucalyptus; this Australian native can be grown on well drained soils in USDA zones 9 to 11. Copyright 2005 with all rights reserved by Michael A. Arnold; intended for future inclusion in Landscape Plants for Texas and Environs, Third Edition..