Flora of North America species comparison

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Astragalus miser var. praeteritus
Photo is of parent taxon

Yellowstone milkvetch
Herbage

strigulose, hairs obscurely malpighian, silvery cinereous, ± straight.
Stems

(1.5–)2.5–20 cm.
Leaves

(1.5–2.5–9.5 cm; leaflets 7–13(–17), blades linear to linear-elliptic or oblong-elliptic, 2–20 mm, apex attenuate to acute, surfaces pubescent;

terminal leaflet confluent with rachis.
Racemes

loosely (3–)5–12-flowered;

axis (1–)1.5–7.5 cm in fruit.
Flowers

calyx (2.3–)2.8–3.9 mm, tube (1.7–)2.2–2.9 mm, lobes 0.6–1.4 mm;

corolla whitish, ochroleucous, or stramineous, sometimes brownish-veined, keel apex maculate;

banner 6.6–8.6 mm;

keel 6.2–8.3(–8.8) mm.
Legumes

linear or linear-oblanceoloid, 11–20 × (2–)2.5–3.4 mm, strigulose.
Seeds

7–11.

Astragalus miser var. praeteritus
Phenology Flowering May–Aug.
Habitat Banks, hillsides, gravelly ridges, in sagebrush upward into lodgepole pine forest.
Elevation 2200–2900 m. (7200–9500 ft.)
Distribution
from FNA
ID; MT; WY
[BONAP county map]
Discussion

Variety praeteritus occurs in southwestern Montana on the upper forks of the Missouri River to adjoining east-central Idaho, to Yellowstone Park and Grand Tetons in northwestern Wyoming.

D. Isely (1998) stated that var. praeteritus represents the more northern aspects of an expanded var. tenuifolius, based on the presence of malpighian pubescence, and he synonymized the two under the latter name. He was unsuccessful in correlating pubescence with geography. It is probable that the two varieties are best combined, but there is a tendency for plants of var. praeteritus to have broader leaflets.

(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. serotinus, A. miser var. tenuifolius
Name authority Barneby: Amer. Midl. Naturalist 55: 483. (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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