Astragalus coltonii var. moabensis

M. E. Jones

Contr. W. Bot. 8: 11. 1898. (as coltoni)

Common names: Moab milkvetch
Endemic
Treatment appears in FNA Volume 11.

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.

Lower Taxa

None.
Stanley L. Welsh +
M. E. Jones +
Moab milkvetch +
Ariz. +, Colo. +, N.Mex. +, Utah +  and Wyo. +
1400–2600 m. +
Pinyon-juniper and mountain brush communities. +
Flowering Apr–Jun. +
Contr. W. Bot. +
Papilionoideae de +
Astragalus coltonii var. moabensis +
Astragalus coltonii +
variety +