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Open As a Single Document The Magazine of the Arnold Arboretum VOLUME 71 • NUMBER 2 The Magazine of the Arnold Arboretum VOLUME 71 • NUMBER 2 • 2013 CONTENTS Arnoldia (ISSN 0004–2633; USPS 866–100) 2 The Strange Range of Seaside Alder is published quarterly by the Arnold Arboretum J. Matthew Jones of Harvard University. Periodicals postage paid at Boston, Massachusetts. 12 Alfred Rehder: His German Roots Subscriptions are $20.00 per calendar year Dr. Arnd Rüdiger Grimmer domestic, $25.00 foreign, payable in advance. Remittances may be made in U.S. dollars, by 18 Remembering Alfred Rehder check drawn on a U.S. bank; by international Lisa Pearson money order; or by Visa, Mastercard, or American Express. Send orders, remittances, requests to 25 Dispersal purchase back issues, change-of-address notices, and all other subscription-related communica- Anna Laurent tions to Circulation Manager, Arnoldia, Arnold Arboretum, 125 Arborway, Boston, MA 02130- 32 Standing Tall: The Upright Swede (Tilia 3500. Telephone 617.524.1718; fax 617.524.1418; cordata ‘Swedish Upright’) e-mail [email protected] Michael S. Dosmann Arnold Arboretum members receive a subscrip- tion to Arnoldia as a membership benefit. To Front cover: The maple (Acer) collection at the Arnold become a member or receive more information, Arboretum is a hotspot for colorful autumn foliage, please call Wendy Krauss at 617.384.5766 or including this Acer pubipalmatum (accession 320- email [email protected] 2004-A) grown from seeds wild collected in China. Photo by Kyle Port. Postmaster: Send address changes to Arnoldia Circulation Manager Inside front cover: Alfred Rehder posed on the steps of The Arnold Arboretum the Arboretum’s Hunnewell Building on September 1, 125 Arborway 1933, during a celebration in honor of his 70th birthday. Boston, MA 02130–3500 Photo from the Archives of the Arnold Arboretum. Nancy Rose, Editor Andy Winther, Designer Inside back cover: The distinctive form of Tilia cordata ‘Swedish Upright’, an Arnold Arboretum introduction, is Editorial Committee seen in this 1989 photo by István Rácz and Zsolt Debreczy. Phyllis Andersen Photo from the Archives of the Arnold Arboretum. Peter Del Tredici Michael S. Dosmann Back cover: A sugar maple (Acer saccharum acces- William (Ned) Friedman sion 12565-C) in golden autumn foliage glows in the Kanchi N. Gandhi Arboretum’s maple collection. This plant was collected in the wild near Malden, Massachusetts, by Arbore- Copyright © 2013. The President and Fellows of Harvard College tum propagator and superintendent Jackson Dawson in October 1883. Photo by Kyle Port. The Strange Range of Seaside Alder J. Matthew Jones lant species exhibit considerable variation dispersal events, or can be remnants of a for- in their native ranges. Some species, such merly more widespread range that has since Pas the North American white oak (Quer- retracted. Disjunct populations of a given spe- cus alba), are abundant and have a continuous cies are often highly isolated from one another, range across half the continent. Other species, which can reduce the likelihood of pollen and like the dawn redwood (Metasequoia glyp- seed dispersal (and thus gene flow) among popu- tostroboides) in China, are rare and natively lations. Consequently, isolated populations are restricted to a small location in the wild. In more prone to inbreeding and random selec- addition to being rare, some species exhibit tion, which, over time reduces genetic diversity disjunct, or widely separated, populations. Dis- and a population’s ability to adapt to environ- junct populations can arise either by unusual mental change. Therefore, studying disjunct Delaware A. maritima ssp. maritima Maryland Oklahoma A. maritima Georgia A. maritima ssp. oklahomensis ssp. georgiensis Seaside alder (Alnus maritima) comprises three small, widely disjunct populations in Maryland, Georgia, and Oklahoma. Seaside Alder 3 populations is important for understanding how habitat fragmentation affects biodiver- sity and species’ long-term via- bility, as well as for helping to assess conservation strategies that maintain genetic diversity. Introducing Seaside Alder: The Alder That Does Not Grow by the Seaside Seaside alder is among the most disjunctly distributed tree species in North Amer- H. MOHLENBROOK, USDA-NRCS PLANTS DATABASE ROBERT ica, with major populations so widely separated that they are recognized as distinct subspe- cies. Alnus maritima subsp. maritima occurs on the Del- marva Peninsula, specifically Foliage and catkins of Alnus maritima. along tributaries and streams of the Naticoke, Pocomoke, and Wicomico Alnus maritima and other members of the Rivers of Maryland’s Eastern Shore, as well birch family (Betulaceae, 230 species world- as along rivers, ponds, and dammed creeks in wide) are recognized by their distinctive floral Delaware. Alnus maritima subsp. oklahomen- catkins and conelike infructescences. Stami- sis is restricted to four populations on the Blue nate (male) inflorescences are elongate catkins River and two of its tributaries in south central that hang loosely at the tips of branches, typical Oklahoma, while A. maritima subsp. georgien- of trees that disperse pollen by wind. The tiny, sis occurs along opposite sides of a single pond apetalous, pistillate (female) flowers sit above in Bartow County, Georgia. What historical, woody, scalelike leaves (bracts), arranged as a ecological, and physiological factors caused this spike in the leaf axils. At maturity, the woody disjunct distribution? How genetically diverse bracts on the “cones” spread apart to release the are each of the regional subspecies and how water-dispersed seeds. Unlike birches, which might this affect their long-term viability? have deciduous three-lobed bracts, alders’ five- Alnus maritima is a large shrub or small tree lobed woody bracts persist well into the fol- that tends to grow in spreading, multi-stemmed lowing season, yielding an attractive display of clumps in wet soils along banks of ponds, inch-long spent “cones” in winter. streams, and even fast moving rivers. Seaside Eight species of alder occur in North America. alder’s roots can tolerate partial submergence in Flower-to-seed development of most of these water and, similar to legumes, have a symbiotic species requires a full year. Floral buds initiate relationship with bacteria that assimilate atmo- in summer, go dormant over winter, open for spheric nitrogen. Despite its name, A. maritima pollination the following spring, and disperse doesn’t occur on the seaside and is intolerant their seeds in late summer and autumn. Alnus of saline soils. Individual trunks are usually 10 maritima, however, initiates floral develop- to 13 centimeters (4 to 5 inches) in diameter, ment in spring, opens for pollination in late 5 to 7 meters (16 to 23 feet) tall, and covered summer to early autumn, and releases seeds in in smooth, light gray bark. The simple, alter- late autumn or early winter of the same year. nate leaves are narrowly elliptical to obovate in This phenological sequence (supported by more shape, with a lustrous surface, leathery texture, recent genetic data) delineates the alder sub- and singly serrated margins. genus Clethropsis, a clade that A. maritima Seaside Alder 5 shares with the Himalayan alder (A. nitida) and the Formosan alder (A. formosana). This means that seaside alder’s nearest extant relatives are in southern Asia (Chen and Li 2004). J. PHIL GIBSON Investigating the Causes and Consequences of the Disjunction Schrader and Graves (2002) classified the three regional populations of seaside alder as three subspecies. Subspecies are a taxonomic rank- ing used to distinguish geographically isolated populations of species that often have unique morphological features and specialized adapta- tions to local environments. Alnus maritima subsp. oklahomensis is the most distinctive of the three subspecies, with narrower leaves and larger trunks and canopies compared to the Del- marva (A. maritima subsp. maritima) and Geor- gia (A. maritima subsp. georgiensis) subspecies. A. maritima subsp. oklahomensis also occurs in more phosphorus deficient and alkaline soils than the other subspecies. Alnus maritima subsp. maritima was the first population recognized in the early nine- teenth century. Seaside alder’s strange distribu- tion was first noted when Elihu Hall discovered populations along the Blue River in the Indian Territory during his exploration of the region in Alnus maritima subsp. oklahomensis has narrower leaves and 1872. Was this the result of a dispersal event or larger trunk and canopy size than the other two subspecies of the remnant of a formerly broader range? John seaside alder. Furlow (1979), in his comprehensive mono- graph of American alder species, proposed that Population Genetics as a Research Tool the Oklahoma population was a relict of range Population genetics, the study of genetic diver- retraction, noting the fossil evidence of related sity within and among populations of organ- species further west. Virginia Stibolt’s (1981) isms, has further clarified the nature of seaside study of seaside alder distributions suggested alder’s present disjunct distribution. Addition- the Oklahoma population might be the result ally, using population genetics techniques can of dispersal by Native Americans, as the Del- help conservation biologists assess the genetic aware Indians were forcibly relocated to the health of the population. Namely, how diverse Indian Territory several decades before Hall’s and genetically distinct
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