Flora of North America species comparison

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Astragalus flavus var. flavus
Photo is of parent taxon
Habit Plants forming tufts.
Racemes

slightly to much surpassing leaves.
Peduncles

usually to 12 cm.
Flowers

11–17.8 mm;

calyx 4–7.5 mm, strigose to short-villous, tube 3.2–5.2 mm;

corolla usually cream to lemon yellow, rarely suffused with pale pink or purple.
Seeds

8–17.
2n

= 24, 26.

Astragalus flavus var. flavus
Phenology Flowering Apr–Jul(–Sep).
Habitat Seleniferous substrates composed of saline silts and clays derived from Triassic Chinle and Moenkopi, Jurassic Arapien Shale, Entrada, Curtis, Summerville, Morrison, and Cedar Mountain formations, and from Cretaceous Mancos Shale and Tropic Shale formations, and other similarly fine-textured Tertiary formations, in salt desert shrub, pinyon-juniper communities.
Elevation 800–2300 m. (2600–7500 ft.)
Distribution
from FNA
AZ; CO; NM; UT; WY
[BONAP county map]
Discussion

Sheep poisoning attributable to var. flavus, possibly due to ingestion of selenium, is known from lower elevations of the Uinta Basin in northeastern Utah.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Astragalus > sect. Ocreati > Astragalus flavus
Sibling taxa
A. flavus var. argillosus, A. flavus var. higginsii
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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