Flora of North America species comparison

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Astragalus collinus var. collinus

Astragalus collinus var. laurentii
Photo is of parent taxon

hillside milk-vetch
Photo is of parent taxon

laurent's milkvetch, lawrence's milkvetch
Legumes

usually straight, rarely slightly incurved, linear-oblong, 7–25 × 2.5–3.4(–4) mm, villosulous or loosely strigulose, hairs to 0.3–0.5 mm;

stipe (5)6–15 mm.

gently incurved, obliquely ovoid-oblong, 8–15 × 3.3–4.2 mm, usually villosulous, rarely glabrous, hairs to 0.5–1 mm;

stipe (3.5–)5–10 mm.
Seeds

(10–)12–18.

(7 or)8–12.

Astragalus collinus var. collinus

Astragalus collinus var. laurentii
Phenology Flowering May–Jul. Flowering May–Jul.
Habitat Bunch­grass prairies and sagebrush communities on substrates overlying basalt, pine forests. Dry grassy sites, on sandy or clay soils derived from basalt.
Elevation 200–1000 m. (700–3300 ft.) 800–1100 m. (2600–3600 ft.)
Distribution
from FNA
ID; OR; WA; BC
[BONAP county map]
from FNA
OR
[BONAP county map]
Discussion

In the southwestern corner of Morrow County and adjoining Gilliam County, Oregon, there are extensive and uniform populations of Astragalus collinus with glabrous fruits a little longer than the villosulous fruits of var. laurentii that may have resulted from introgression with A. curvicarpus var. subglaber. The indumentum of the herbage and impressed reticulation of the fruit are characteristic of A. collinus (R. C. Barneby 1964).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 11. FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Astragalus > sect. Collini > Astragalus collinus Fabaceae > subfam. Faboideae > Astragalus > sect. Collini > Astragalus collinus
Sibling taxa
A. collinus var. laurentii
A. collinus var. collinus
Synonyms Homalobus laurentii, A. laurentii
Name authority unknown (Rydberg) Barneby: Amer. Midl. Naturalist 55: 487. (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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