The Magazine of the Arnold Arboretum - Arnoldia - Harvard University

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12 Arnoldia 68/1 individual trees, exists; and Magnolia wilsonii, which is endangered and only exists in scattered populations in Sichuan, northern Yunnan, and Guizhou, China. Two other additions—Magnolia lotungensis from China and M. tamaulipana from northeastern Mexico —may prove to be borderline hardy in Swarthmore (USDA zone 6, average annual minimum temperature -10°F to 0°F [-23.3°C to -17.8°C]). In 2009 the Arboretum introduced a new selection of the Yulan magnolia, Magnolia denudata ‘Swarthmore Sentinel’. The Arboretum originally received a seedling from J. C. Raulston at North Carolina State University, who had received seeds from the Beijing Botanic Garden. From a seedling in 1993, the tree is over 30 feet tall today. On several occasions visiting magnolia experts commented on how upright our particular clone was. Therefore, we decided to name this selection ‘Swarthmore Sentinel’ for its fastigiate habit. Over the last 81 years we have accessioned 502 magnolias at the Scott Arboretum. Today the collection holds 165 different taxa. The Scott Arboretum’s collection is recognized as a national magnolia collection through the American Public Garden Association’s North American Plant Collections Consortium (NAPCC). According to the APGA “The North American Plant Collections Consortium is a network of botanical gardens and arboreta working to coordinate a continent-wide approach to plant germplasm preservation, and to promote high standards of plant collections management.” The Scott Arboretum will be working with approximately 20 other institutions across North America, including San Francisco Botanical Garden, Quarryhill Botanical Garden, University of British Columbia Botanical Garden, the Bartlett Arboretum, and Atlanta Botanical Garden to create a consortium of institutions to oversee the preservation and conservation of Magnoliaceae germplasm. This group will also be part of the NAPCC and administered through the APGA. Once formed, this Magnolia Curatorial Group will partner with the Magnolia Society International to target both wild species and cultivar groups which need to be preserved in botanic gardens and arboreta. The Scott Arboretum Magnolia ‘Charles Coates’ is an unusual hybrid between M. sieboldii and M. tripetala. will also continue to grow its own collections. We currently have 72 magnolia taxa growing in a nursery, and once these reach specimen size they will be transplanted to garden sites throughout the arboretum. In 2015 the Scott Arboretum plans to host the international meeting of the Magnolia Society International. Bibliography Callaway, D.J. 1994. The World of Magnolias. Timber Press, Portland, Oregon. Gardiner, J. 2000. Magnolias: A Gardener’s Guide. Timber Press, Portland, Oregon. Liu, Y.H. 2004. Magnolias of China. Hong-Kong, Beijing Science & Technology Press. Treseder, N.G. 1978. Magnolias. Faber and Faber, Limited, London and Boston. Wister, J.C. Swarthmore Plant Notes 1930–1954, Volume 1, Part 1. pp. 80–88. Yagoda, B. 2003. The Scott Arboretum of Swarthmore College—The First 75 Years. The Donning Company Press. Andrew Bunting is Curator of the Scott Arboretum of Swarthmore College in Swarthmore, Pennsylvania. Scott Arboretum
Excerpts from Wild Urban Plants of the Northeast: A Field Guide Peter Del Tredici Editor’s Note: Ever wonder what kind of tree that is, the one growing from a crack in the asphalt parking lot at work? Or what that tangled vine engulfing the slope by the subway station might be? Wild Urban Plants of the Northeast: A Field Guide, written by long-time Arnold Arboretum researcher Peter Del Tredici, may have your answer. Del Tredici’s goal with this book is “to help the general reader identify plants growing spontaneously in the urban environment and to develop an appreciation of the role they play in making our cities more livable.” Many of the 222 plants featured in the book could be called weeds, and some are notoriously invasive. The author eschews these labels, however, pointing out that in many urban/suburban areas the environment has been so radically altered (think non-native fill soils, soil compaction and contamination, impermeable pavement, and pollution) that the presence of any plants has benefits. This handy guide is organized by plant families and includes both woody and herbaceous plants. Numerous color photographs and extensive information is provided for each species, including place of origin, descriptions of vegetative, flower, and fruit characteristics, and habitat preference. Some fascinating details emerge from the “Cultural Significance” subsections—for example: “During World War II, the silky seed hairs [of common milkweed, Asclepias syriaca] were used as a substitute for kapok to fill “Mae West” life vests. Between 1943 and 1945, a million such flotation devices were filled with the floss from some 24 million pounds (11 million kilograms) of milkweed pods.” Following are half a dozen plant species featured in the book. Reprinted from: Peter Del Tredici, Wild Urban Plants of the Northeast: A Field Guide. Copyright © 2010 by Cornell University. Used by permission of the publisher, Cornell University Press. 374 pages. ISBN 978-0-8014-7458-3.
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