Astragalus coltonii var. moabensis
Contr. W. Bot. 8: 11. 1898. (as coltoni)
Stems strigulose, cinereous, greenish cinereous, or canescent; from subterranean caudex. Leaves odd-pinnate, (2–)3–9 cm; leaflets (5–)9–17(or 19), blades oblong, cuneate-oblong, or ovate, (3–)5–20 mm, apex obtuse, truncate, or retuse, surfaces brighter green and, usually, less densely pubescent abaxially; leaflets jointed or joint obscure in distal ones. Peduncles (4–)6.5–21 cm. Racemes (6–)10–30-flowered. Legumes 19–35 × (3–)3.5–6 mm; stipe 5–11 mm.
Phenology: Flowering Apr–Jun.
Habitat: Pinyon-juniper and mountain brush communities.
Elevation: 1400–2600 m.
Distribution
Ariz., Colo., N.Mex., Utah, Wyo.
Discussion
Variety moabensis is primarily in the Four Corners region of Apache and Navajo counties in northeastern Arizona, Dolores, Mesa, Montezuma, and Montrose counties in southwestern Colorado, San Juan County in northwestern New Mexico, and Grand and San Juan counties in southeastern Utah. The populations in Sweetwater and Uinta counties in southwestern Wyoming may represent recent introductions due to livestock transport.
Selected References
None.