A Catalog of Cultivated Woody Plants of the 

 Southeastern United States 



by Frederick G. Meyer, Peter M. Mazzeo, and Donald H. Voss 



Scope 



This catalog presents a comprehensive reference 

 list, based on documented material, of the trees, 

 shrubs, suffruticose plants, and woody climbers 

 cultivated in the southeastern United States. A 

 list of acronyms identifies the collection sites for 

 each entry. While the southeastern United 

 States is well served by botanical manuals and 

 other floristic works that identify native plants, 

 such works on the cultivated woody plants 

 (indigenous and introduced) of the southeastern 

 states have been much neglected. 



The catalog contains about 5,000 entries — 

 species, subspecies, varieties, forms, and culti- 

 vars — in 112 plant families and 493 genera. 

 These are based on more than 14,000 voucher 

 herbarium specimens, most collected specifically 

 for this project. The primary focus of the project 

 has been a critical review for correct identifica- 

 tion and nomenclature of material in the list. 

 This material, now permanently deposited in the 

 herbarium of the U. S. National Arboretum, was 

 collected at nearly 700 sites in Alabama, Arkan- 

 sas, Delaware, the District of Columbia, northern 

 Florida, Georgia, Louisiana, Maryland, Missis- 

 sippi, North Carolina, South Carolina, Tennes- 

 see, southeastern Texas, and Virginia. This area 

 covers about one-sixth of the continental United 

 States and spans Plant Hardiness Zones 6b 

 through 9a (U.S. Department of Agriculture 

 1990). The collection sites include botanical 

 gardens and arboreta, cemeteries, college cam- 

 puses, experiment stations, nurseries, private 

 gardens, and roadway plantings. 



While comprehensiveness was an objective, the 

 catalog makes no claim to completeness, since 

 new plants are constantly being introduced to 

 horticulture; and from a practical standpoint we 

 were unable to visit every possible site. In genera 

 such as Camellia, Rosa, Rhododendron, Hedera, 

 and some others with a vast number of cultivars, 

 completeness was simply not possible. However, 



Meyer is a supervisory botanist (retired) and Mazzeo is a 

 botanist, U.S. National Arboretum, Agricultural Research 

 Service, U.S. Department of Agriculture. Washington, DC 

 20002; Voss, of Vienna, Virginia, prepared the computer data 

 base and programming for the catalog and assisted in the 

 checking of nomenclature. 



a large number of plants not previously listed or 

 reported as cultivated in the United States are 

 included as a result of recent introductions. 



The catalog includes many unusual or rare 

 plants from the living collections of the U. S. 

 National Arboretum not well represented else- 

 where in this country. Between 1961 and 1990, 

 125 cultivars in 18 genera were released by the 

 National Arboretum to the horticultural indus- 

 try — cultivars of Buxus, Camellia, Clematis, 

 XCupressocyparis, Eurya, Hibiscus, Ilex, Kalmia, 

 Lagerstroemia, Magnolia, Malus, Metasequoia, 

 Platanus, Pyracantha, Pyrus, Rhododendron, 

 Ulmus, and Viburnum. The catalog also lists for 

 the first time most of the dwarf and slow-growing 

 conifers in the Gotelli Collection at the U.S. 

 National Arboretum. The list of Ilex, the largest 

 of any genus in the catalog, is based primarily on 

 the extensive collections of living plants and 

 voucher herbarium specimens at the U.S. Na- 

 tional Arboretum. 



The authors are solely responsible for the names 

 and identifications of the plants listed in the 

 catalog, but in difficult genera such as Acer, 

 Aesculus. Callistemon. Crataegus. Hydrangea, 

 Rex, Salix, and Viburnum, we had the expertise of 

 specialists who generously provided names and 

 verified identifications. In this introduction, 

 most of the botanical names are cited without 

 authorities, since these are properly listed with 

 the names in the catalog; but sometimes authori- 

 ties are cited to substantiate a point. 



The catalog is arranged alphabetically by the 

 internationally accepted botanical and cultivar 

 names, including some synonyms. Vernacular, 

 or common, names are also included for many 

 entries. When a species is subdivided, the 

 epithet for the infraspecific taxon that includes 

 the type of the species name is an exact repeti- 

 tion of the specific epithet (an autonym) and is 

 cited without the author's name. The list of 

 collection-site acronyms in Appendix B identifies 

 the sources of the documented voucher speci- 

 mens, thereby providing information on the 

 abundance, distribution, and hardiness range of 

 the plants listed. 



