Flora of North America species comparison

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Astragalus flavus var. flavus

Astragalus sect. Ocreati
Photo is of parent taxon
Habit Plants forming tufts. Herbs perennial, selenophytes, loosely tufted, ill-scented, caulescent; caudex usually superficial.
Stems

several to many.
Leaves

odd-pinnate, petiolate;

leaflets (5 or)7–21, terminal leaflet usually jointed, rarely confluent.
Racemes

slightly to much surpassing leaves.

densely or loosely flowered, flowers ascending.
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.

Corollas

whitish to cream, lemon yellow, ochroleucous, reddish to lilac, or pink-purple, banner recurved through 45(–90)°, keel apex obtuse.
Calyx

tubes campanulate or turbinate-campanulate.
Legumes

eventually deciduous, sessile, erect, ascending, or spreading, ovoid or oblong to ellipsoid, compressed dorsiventrally, laterally, or obcompressed, unilocular.
Seeds

8–17.

4–17.
Hairs

basifixed or malpighian.
Stipules

connate or distinct at distal nodes.
2n

= 24, 26.

Astragalus flavus var. flavus

Astragalus sect. Ocreati
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]
w United States
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.)

Species 3 (3 in the flora).

Section Ocreati consists of two subsections distributed from southern Nevada eastward and northward to northern New Mexico, Colorado, and Wyoming. The subsections are: subsect. Ocreati (A. Gray) Barneby (Astragalus flavus, A. sophoroides); and subsect. Moencoppenses Barneby (A. moencoppensis).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 11. FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Astragalus > sect. Ocreati > Astragalus flavus Fabaceae > subfam. Faboideae > Astragalus
Sibling taxa
A. flavus var. argillosus, A. flavus var. higginsii
Subordinate taxa
Name authority unknown A. Gray: Proc. Amer. Acad. Arts 6: 201. (1864)
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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