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laurent's milkvetch, lawrence's milkvetch

Legumes

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

(7 or)8–12.

Astragalus collinus var. laurentii

Phenology Flowering May–Jul.
Habitat Dry grassy sites, on sandy or clay soils derived from basalt.
Elevation 800–1100 m. (2600–3600 ft.)
Distribution
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.
Parent taxa Fabaceae > subfam. Faboideae > Astragalus > sect. Collini > Astragalus collinus
Sibling taxa
A. collinus var. collinus
Synonyms Homalobus laurentii, A. laurentii
Name authority (Rydberg) Barneby: Amer. Midl. Naturalist 55: 487. (1956)
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