Flora of North America species comparison

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Astragalus missouriensis var. missouriensis
Photo is of parent taxon

Missouri milk-vetch
Habit Plants usually shortly caulescent, sometimes subacaulescent.
Stems

to 15 cm.
Racemes

(3–)5–15-flowered.
Flowers

calyx 9–12(–14.3) mm, tube 6.3–9(–9.3) mm, lobes 1.4–4.5(–5.3) mm;

corolla usually pink-purple, rarely white;

banner (14.5–)16–22(–24) mm;

keel (11.5–)12.8–17.3(–18.5) mm.
Legumes

ascending, initially subterete or ± dorsiventrally compressed, ± straight, subsymmetrically oblong-ellipsoid, ± laterally compressed and obtuse-angled when mature, 15–28(–30) × (4–)5–9(–10) mm, subunilocular, base obtuse or sometimes cuneate, apex abruptly contracted into subulate, pungent beak, sutures prominent, strigulose.
Seeds

(33–)40–50(–56).
2n

= 22.

Astragalus missouriensis var. missouriensis
Phenology Flowering late Mar–Jul.
Habitat Prairies, valleys, hillsides, dry open places, on limestone, shale, sandstone, or gyp­sum substrates.
Elevation 300–2400 m. (1000–7900 ft.)
Distribution
from FNA
AZ; CO; IA; KS; MN; MT; ND; NE; NM; OK; SD; TX; WY; AB; MB; SK
[BONAP county map]
Discussion

There is an irregular cline in flower size of var. missouriensis, from smallest in the north to largest in the south; caulescent forms appear to be more common southward (D. Isely 1998).

(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. humistratus, A. missouriensis var. mimetes
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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