Flora of North America species comparison

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Astragalus chuskanus var. spellenbergii

Astragalus sect. Humistrati
Photo is of parent taxon

Spellenberg's milkvetch
Habit Plants robust. Herbs perennial, mat-, clump-, or cushion-forming, stems prostrate, caulescent; caudex superficial or subterranean.
Stems

several to many.
Leaves

odd-pinnate, usually petiolate, sometimes subsessile to short-petiolate;

leaflets (3 or)5–17(or 19).
Leaflet

blades flat, not keeled, surfaces inconspicuously gray-hairy.

Racemes

compactly flowered, flowers ascending or spreading.
Flowers

calyx 5.5–6.9 mm, tube 3–3.8, lobes 2–3.1 mm;

corolla banner 8–10 mm.

Corollas

whitish, ochroleucous, greenish, pink-purple, or purple, banner recurved through 40–85°, keel apex obtuse or acuminate and beaked.
Calyx

tubes campanulate, sometimes obconic-campanulate.
Legumes

deciduous, sessile, ascending or spreading, sometimes, usually humistrate, ovoid, oblong, or oblong-ellipsoid, compressed dorsiventrally proximally or 3-sided, unilocular.
Seeds

4–26.
Hairs

basifixed or malpighian.
Stipules

connate or distally distinct.
2n

= 24.

Astragalus chuskanus var. spellenbergii

Astragalus sect. Humistrati
Phenology Flowering Jun–Jul.
Habitat Slopes of degraded Pliocene Chuska Sandstone, with ponderosa pine, Douglas-fir, and oak.
Elevation 2200–2800 m. (7200–9200 ft.)
Distribution
from FNA
AZ; NM
w United States; sc United States; nw Mexico
Discussion

Species 4 (4 in the flora).

Section Humistrati consists of two subsections distributed in Arizona, New Mexico, Nevada, eastern Oregon, southern Utah, southwestern Colorado, and trans-Pecos Texas.

The subsections are: subsect. Humistrati (Astragalus humistratus, A. sesquiflorus); and subsect. Micromerii Barneby (A. chuskanus, A. micromerius).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 11. FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Astragalus > sect. Humistrati > Astragalus chuskanus Fabaceae > subfam. Faboideae > Astragalus
Sibling taxa
A. chuskanus var. chuskanus
Subordinate taxa
Synonyms A. subg. m.
Name authority S. L. Welsh & N. D. Atwood in S. L. Welsh: N. Amer. Sp. Astragalus, 128. (2007) (M. E. Jones) Barneby: Mem. New York Bot. Gard. 13: 383. (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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