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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 543176 | 'Pathfinder' | Ulmus parvifolia Jacq. | District of Columbia, United States | NC7 |  | | 1990 | DONATED | 08/09/1990 | | | | | Cultivar | Tree vase-shaped, pendulous crown. Height 11.3m and crown spread 9.7m at 27 years of age. Bark has lacebark quality, mixed colors and textures. Outer bark varies from black (202C) to grey (201C), and greyed green (195A) but flakes off with age, revealing a grey orange (165B) color. Leaves typical for species, greyed red (178A) color in autumn. Fruits red purple (59A), ripens in mid-October in Ohio. Cold tolerant reliably to zone 5a. Resistant to Ceratocystis ulmi and Xanthogaleruca luteola. Use includes landscape, highway, street, or shade planting. Progagated from softwood cuttings | 1438112 | PI 543176 |
| 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 |