Flora of North America species comparison

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Astragalus sect. Sericoleuci
Habit Herbs perennial, mat- or cushion-forming, caulescent or acaulescent; caudex superficial.
Stems

several to numerous, sometimes obscured by stipules.
Leaves

palmately trifoliolate (except sometimes 5-foliolate in A. sericoleucus), petiolate.
Racemes

subumbellate or loosely flowered, exserted or included in stipular sheath, flowers ascending.
Corollas

usually pink-purple, rarely white, banner recurved through 40–90°, keel apex round, bluntly deltate, or subacutely triangular, sometimes ± beaklike.
Calyx

tubes campanulate, campanulate-turbinate, or subcylindric.
Legumes

deciduous, sessile, ascending to recurved, invested by calyx or partly exserted, lanceoloid- or ovoid-ellipsoid, straight, slightly compressed or obscurely 3-sided compressed, unilocular.
Seeds

(2 or)6–12.
Hairs

malpighian.
Stipules

connate-sheathing.

Astragalus sect. Sericoleuci
Distribution
w United States; c United States
Discussion

Species 4 (4 in the flora).

Section Sericoleuci is distributed in northeastern Colorado, western Kansas, southeastern Montana, western Nebraska, western South Dakota, northeastern Utah, and Wyoming.

D. Isely (1998) placed the species in sect. Sericoleuci and sect. Orophaca in the genus Orophaca (Torrey & A. Gray) Britton, emphasizing the isolated nature of the group, the trifoliolate leaves, and the base chromosome number of x = 12. M. F. Wojciechowski et al. (1999) found that A. aretioides and A. sericoleucus, and presumably other species Isley treated in Orophaca, are clearly nested within North American Astragalus and not distinct from it.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Astragalus
Subordinate taxa
Name authority Barneby: Mem. New York Bot. Gard. 13: 1143. (1964)
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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