Flora of North America species comparison

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Astragalus coltonii var. coltonii
Photo is of parent taxon

Colton's milkvetch
Stems

strigulose;

from subterranean or superficial caudex.
Leaves

odd-pinnate or distalmost unifoliolate, 2–10 cm;

leaflets (1 or)3–11, blades usually linear, rarely linear-oblong, 4–14 mm, apex obtuse or acute, surfaces brighter green and, usually, less densely pubescent abaxially;

terminal leaflet confluent with rachis.
Racemes

(2–)5–20-flowered.
Peduncles

10–30 cm.
Legumes

25–32 × (3–)3.5–5.2 mm;

stipe 4–9 mm.

Astragalus coltonii var. coltonii
Phenology Flowering Apr–Jun.
Habitat Bunchgrass, salt desert shrub, pinyon-juniper, and mountain brush communities.
Elevation 1400–2300 m. (4600–7500 ft.)
Distribution
from FNA
CO; UT
[BONAP county map]
Discussion

Variety coltonii occurs almost exclusively below the coal measures of the Mesaverde Group sandstone. However, the type specimen was collected on another substrate near Richfield, Sevier County, Utah. The primary range of var. coltonii is in Carbon, Emery, Garfield, Grand, Kane, Millard, Sevier, and Wayne counties in Utah, and a disjunct population occurs in Montezuma County in Colorado.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Astragalus > sect. Lonchocarpi > Astragalus coltonii
Sibling taxa
A. coltonii var. moabensis
Name authority unknown
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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