Flora of North America species comparison

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Astragalus missouriensis var. humistratus
Photo is of parent taxon

archuleta milkvetch, Missouri milkvetch
Habit Plants caulescent.
Stems

10–15(–20) cm.
Racemes

9–12-flowered.
Flowers

calyx 7.8–10 mm, tube 6–10 mm, lobes 1.5–3 mm;

corolla lavender, purple, or almost white, wing tips often white;

banner (17–)19–20.5 mm.
Legumes

ascending to descending, dorsiventrally compressed, lunately incurved, oblong-ellipsoid, (12–)17–20 × 6–9 mm, unilocular, apex obcompressed proximal to incurved beak, glabrous or sparsely strigulose.
Seeds

33–40.

Astragalus missouriensis var. humistratus
Phenology Flowering May–Jul.
Habitat Oak brush with scattered pon­derosa pine on clay knolls, pinyon-juniper woodlands, associated with Lewis and Mancos formations.
Elevation 2100–2500 m. (6900–8200 ft.)
Distribution
from FNA
CO; NM
[BONAP county map]
Discussion

Variety humistratus is locally distributed in Archuleta, Hinsdale, and La Plata counties, Colorado, and adjacent Rio Arriba County, New Mexico. It is anomalous in its strongly caulescent but mat-forming habit, and the slightly or plainly connate stipules. R. C. Barneby (1964) suggested a hybrid origin between Astragalus missouriensis and A. humistratus.

Variety humistratus is in the Center for Plant Conservation’s National Collection of Endangered Plants.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Astragalus > sect. Argophylli > Astragalus missouriensis
Sibling taxa
A. missouriensis var. amphibolus, A. missouriensis var. mimetes, A. missouriensis var. missouriensis
Name authority Isely: Syst. Bot. 8: 423. (1983)
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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