| 0 | Ames 33733 | JDC/BP/2016/039/754 | Betula pumila L. | Iowa, United States | NC7 |  | | 2016 | COLLECTED | 08/29/2016 | Clear Creek Wildlife Management Area located approximately 4.5 miles east, southeast of Dorchester just off Golden Ridge Road. T100N R5W NW ¼ SE ¼ NW ¼ Sec. 27 Allamakee County. | 43.45316700, -91.42476900 | 215 | High-quality, wetland fen of Clear Creek watershed. Growing in association with Solidago speciosa, Gentiana alba, Salix candida, Salix pedicellaris, Spiranthes (either cernua or magnicamporum), Parnassia (likely glauca), Monarda fistulosa, Eutrochium maculatum, Prunella vulgaris, Impatiens capensis, Betula papyrifera (2 specimens noted), Betula hybrid (1 specimen noted, likely B. x sandbergii), and Helianthus grosseserratus. | Wild material | | 1942684 | Ames 33733 |
| 1 | Ames 32956 | JDC/BX/2015/043/700 | Betula ×sandbergii Britton | Iowa, United States | NC7 | | Not Available | 2015 | COLLECTED | 09/04/2015 | Private property approximately 2.5 miles south, southeast of Lawler. T95N R11W NW 1/4 NE 1/4 NE 1/4 Sec. 22 Chickasaw County. | 43.03607800, -92.12583700 | 347 | Dry, peaty soil. Growing in Palms muck soils in association amongst an extremely dense thicket of Ambrosia trifida and Urtica gracilis. | Wild material | Betula x sandbergii = B. pumila x B. papyrifera. All B. x sandbergii specimens noted were approximately 30-40' in height with golden-brownish peeling bark. Largest diameter specimen measured 5 9/10" d.b.h. Fruiting heavily. Female catkins mostly all brown and actively dispersing seeds at time of harvest. Prior reports indicated this area to be "one of the best fens on the Iowan Surface - numerous rare species noted with approximately 500+plants of B. pumila in the northern part of the fen (Leoschke 1987); "mounded spring fen dominated by B. pumila" (Horton 1987); "2000+ ramets, dominant throughout most of the fen" (Leoschke 1989); and "dominant shrub in cold, peaty fen" (Nekola 1990). According to the USDA-NRCS Web Soil Survey the area is largely Palms muck soils. Likely sometime after 1990, changes in hydrology resulted in a drastic reduction of available soil moisture and loss of many plant taxa. As of 2015, only three specimens of B. pumila were noted. | 1927398 | Ames 32956 |
| 2 | Ames 32957 | JDC/BP/2015/044/701 | Betula pumila L. | Iowa, United States | NC7 |  | | 2015 | COLLECTED | 09/04/2015 | Private property approximately 1.5 miles northwest of Lawler. T96N R11W SW 1/4 SW 1/4 Sec. 32 Chickasaw County. | 43.08335400, -92.17787800 | 349 | High-quality remnant wetland/fen. Growing in Plams muck soils in association with Salix spp., Cornus racemosa, Oncolea sensibilis, Spiraea alba, Gentiana spp., Carex spp., Populus tremuloides, and Ambrosia trifida. Noted four specimens likely B. x sandbergii that were approximately 30-35' in height. | Wild material | B. pumila could be considered a dominant species in portions of this site. Female catkins were both green and brown at time of harvest. Specimens average approximately 275 cm in height. Little to no fall color. Approximately 75% of leaves were already dropped. | 1927399 | Ames 32957 |