| 0 | PI 495875 | 14A | Alnus incana (L.) Moench subsp. tenuifolia (Nutt.) Breitung | Colorado, United States | NC7 | | | 1984 | COLLECTED | | Along stream bed on way to city reservoir, W end of Kremmlin g, Colorado | | 2211 | | Wild material | Single small heavily fruited deciduous tree. Some leaf miner present. | 1390811 | PI 495875 |
| 1 | PI 479294 | NA 51215 | Alnus hirsuta (Spach) Turcz. ex Rupr. | Japan | NC7 | | | 1982 | COLLECTED | 09/28/1982 | Arboretum. Tokyo Univ. Furano Forest, Yamabe, Furano-shi, Hokkaido | 43.23333333, 142.40000000 | | | Cultivated material | Snow cover 2.5m per annum. Minimum temperature -30C. Tree deciduous, small, 6m tall. Leaves lustrous, green above, glaucous beneath. Seed collected from one tree. Collected as A. inokuma. | 1374230 | PI 479294 |
| 2 | PI 479297 | NA 51168 | Alnus japonica (Thunb.) Steud. | Japan | NC7 | | | 1982 | COLLECTED | 09/23/1982 | East, 7km of Kushiro along hwy 44, Kushiro-shi, Hokkaido | 42.98333333, 144.45000000 | | | Wild material | Snow cover 50cm. Minimum temperature -28C. Tree deciduous, 7.6-9.1m tall. Branches spreading very brittle. Bark rough, light gray. Leaves deep green above, impressed. Growing in a marsh moor, open area; only tree in this habitat. Seed collected from 5 trees. | 1374233 | PI 479297 |
| 3 | Ames 25022 | 190-98P | Alnus japonica (Thunb.) Steud. | Primorye, Russian Federation | NC7 |  | | 1998 | COLLECTED | 09/14/1997 | | 44.19416667, 131.64833330 | | Flat area with wet soil on top of hill. 0 degrees of slope. | Wild material | Shrub, 6-8 feet tall. Further south it grows to tree form, 24-30 feet tall. | 1563774 | Ames 25022 |
| 4 | Ames 24086 | NACPEC97097 | Betula costata Trautv. | Jilin Sheng, China | NC7 | | | 1997 | COLLECTED | 09/10/1997 | Along Yalu River, Changbai County. | 41.62222222, 128.28083330 | 881 | Rocky slopes of 45 with a northwestern aspect. | Wild material | 15-20 m tall, green catkins fruit, and peeling bark that is beige, tan, and brown. | 1553970 | Ames 24086 |
| 5 | Ames 23593 | QLG 175 | Betula utilis D. Don subsp. albosinensis (Burkill) Ashburner & McAll. | Shaanxi Sheng, China | NC7 | | Not Available | 1997 | COLLECTED | 09/25/1996 | Ningxi Forest Bureau, Pu He Forest Station, near Lan Ni Hu, Ning Shan District. | 33.71583333, 108.19777778 | 2215 | Growing on an open, sunny site along the edge of the road in dry conditions. Slope: 15%. Aspect: east. | Wild material | Multi-stemmed, deciduous tree with upright habit and ascending branches; seed collected from young plants; 3.5 m tall; 5-8 cm diameter at breast height; cinnamon-brown exfoliating bark; pendulous fruit. | 1537380 | Ames 23593 |
| 6 | Ames 12981 | 782U/370U | Betula lenta L. f. uber (Ashe) McAll. & Ashburner | Virginia, United States | NC7 |  | | 1990 | COLLECTED | 1982 | Smyth County approximatley 1.24 miles southeast of Sugar Grove. | 36.76666700, -81.38333300 | 840 | Floodplain of Cressy Creek. Growing in association with Betula lenta and Betula alleghaniensis. Rocky debris that is strongly acidic and very permeable | Wild material | Germplasm originally collected in nature and subsquently used for regeneration via controlled pollination. This accession represents the F1 generation from a cross between two trees (782U and 370U) with the round leaf shape phenotype (homozygous for the recessive round leaf shape allele). In a grow out of increased seed representing an F2 generation, all progeny (115 seedlings) had the round leaf phenotype. | 1062072 | Ames 12981 |
| 7 | Ames 10079 | 5 | Betula davurica Pall. | China | |  | Historic | 1988 | DONATED | 08/16/1988 | | | | | Cultivated material | Seed from the Forest Botanical Garden, Renjiaqiao, Harbin, Heilongjiang, China. | 1051520 | Ames 10079 |