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PI 651794
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| ACCESSION | PLANT NAME | TAXONOMY | ORIGIN | GENEBANK | IMAGE | AVAILABILITY | RECEIVED | SOURCE TYPE | SOURCE DATE | COLLECTION SITE | COORDINATES | ELEVATION | HABITAT | IMPROVEMENT LEVEL | NARRATIVE | | |
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| 0 | PI 590997 | 'Valley Forge' | Ulmus americana L. | District of Columbia, United States | NC7 |  | | 1995 | DEVELOPED | | | | | | Cultivar | Introduced by the U.S. National Arboretum in 1995. Tetraploid selected by A. M. Townsend and L. R. Schreiber. Unusually high levels of tolerance to both aggressive and non-aggressive strains of the fungus causing Dutch elm disease. Superior horticultural characteristics. Upright, arching, broad vase-shaped branching structure with full, dense canopy of leaves. Propagules off original parent tree (suspected origin is Nebraska) are 7.9 meters tall with average crown spread of 9.1 meters after 12 growing seasons. Summer leaves average 119 mm long x 74 mm wide and are green but gradually turn yellow in autumn. Bark divided into grayish, flat-topped ridges, separated by roughly diamond-shaped fissures, and is typical of the species. In adaptability trials, performed well in Ohio, Maryland, and the District of Columbia. Adaptable from USDA Zone 5 to 7. Easy to propagate. Excellent for planting in urban and suburban sites, large yards, and recreational and industrial parks. Good street trees where there is wide tree lawn, and where high arching effect is desired. | 1493695 | PI 590997 |
| 1 | PI 536049 | 'Frontier' | Ulmus hybr. | District of Columbia, United States | | | Historic | 1989 | DONATED | 11/07/1989 | | | | | Cultivar | Introduced by the U.S. National Arboretum. At 19 years, plant 8.2m tall with crown spread of 4.9m. Crown pyramidal. Leaves lanceolate, doubly serrate. Young leaves red (47A), mature to yellow green (147A). Autumn leaf color red purple (59A). Branch angle average 51 deg. Bark greyed green (197B) with large orange lenticels. Flowers absent. Reliably adaptable to USDA zone 5. Used as street, park, lanscape or highway tree. High resistance to Dutch elm (Ceratocystis ulmi). Moderate resistance to elm beetle (Xanthogaleruca luteola). Hybrid combination of U. carpinifolia x U. parvifolia. | 1430985 | PI 536049 |
| 2 | PI 536050 | 'Prospector' | Ulmus davidiana Planch. var. japonica (Sarg. ex Rehder) Nakai | District of Columbia, United States | NC7 | | | 1989 | DONATED | 11/07/1989 | | | | | Cultivar | Introduced by the U.S. National Arboretum, originally selected by A.M. Townsend and L.R. Schrieber in 1975 from a 1965 planting of U. wilsoniana seedlings in Delaware, Ohio. High level of resistance in both laboratory and field trials to Dutch elm disease (Ceratocystis ulmi) and elm leaf beetle (Xanthogaleruca luteola). Plant 7.0 m tall with crown spread of 6.4 m at 9 years old. Crown vase-shaped, becoming pendulous at a lower height than American elm. Young leaves orange red (35A), maturing to yellow green (144A) to green (137B). Autumn leaf color yellow (13A). Branch angle average 53 deg. Reliably adaptable to USDA zones 4-7. Excellent street, lawn, highway, or park tree. Heat, drought, and cold tolerant. | 1430986 | PI 536050 |