Flora of North America species comparison

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Astragalus miser var. serotinus
Photo is of parent taxon

Cooper's weedy milkvetch, timber milk-vetch, weedy milk-vetch
Herbage

strigulose, hairs basifixed.
Stems

10–35 cm.
Leaves

4–15(–17.5) cm;

leaflets (9 or)11–19(or 21), blades narrowly elliptic to linear or linear-oblanceolate, (2–)4–30(–40) mm, apex acute or obtuse, surfaces pubescent abaxially, glabrous adaxially.
Racemes

loosely (3–)6–16(–24)-flowered;

axis (1.5–)2.5–14 cm in fruit.
Flowers

calyx 3–4.2 mm, tube 2.3–3.1 mm, lobes 0.7–1.3 mm;

corolla whitish or suffused or veined purple, keel pinkish lilac;

banner 7–9.5 mm;

keel 6–7.8(–8.4) mm.
Legumes

linear-oblong, 13–18(–21) × 2–2.8(–3.2) mm, glabrous or strigulose.
Seeds

7–10.
2n

= 22.

Astragalus miser var. serotinus
Phenology Flowering May–Aug.
Habitat Banks, flats, rocky or grassy slopes, glades in pine forests.
Elevation 200–2000 m. (700–6600 ft.)
Distribution
from FNA
ID; MT; WA; AB; BC
[BONAP county map]
Discussion

Variety serotinus is known from the Columbia Basin in Washington, northward into British Columbia and Rocky Mountains of Alberta, and southward into northwestern Montana.

D. Isely (1998) noted that var. serotinus is contiguous, and blends, with the purple-petaled var. miser. If origin is unknown, var. serotinus is often distinguished from var. hylophilus with difficulty.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Astragalus > sect. Genistoidei > Astragalus miser
Sibling taxa
A. miser var. crispatus, A. miser var. decumbens, A. miser var. hylophilus, A. miser var. miser, A. miser var. oblongifolius, A. miser var. praeteritus, A. miser var. tenuifolius
Synonyms A. serotinus
Name authority (A. Gray) Barneby: Amer. Midl. Naturalist 55: 481. (1956)
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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