familyFabaceae
subfamilyFabaceae subfam. Faboideae
genusAstragalus
sectionAstragalus sect. Leptocarpi
speciesAstragalus nuttallianus
Astragalus nuttallianus var. trichocarpus
Fl. N. Amer. 1: 334. 1838.
Common names: Hairypod milkvetch
Endemic
Synonyms: Astragalus austrinus var. trichocarpus (Torrey & A. Gray) B. L. Turner
Treatment appears in FNA Volume 11.
Plants strigose or hirsutulous. Stems 10–30(–35) cm. Leaves 1–6.5 cm; leaflets 11 or 13, blades broadly elliptic, apex subacute or obtuse, rarely emarginate proximally. Peduncles longer or shorter than leaves. Racemes (1–)3–6-flowered; axis very short in fruit. Flowers: calyx 4–5.4 mm, hirsutulous, tube 2–3 mm, lobes 1.8–2.1 mm; corolla banner (4–)5–7 mm; keel apex triangular-acute or sharply deltate, usually beaklike. Legumes 13–24 × 1.8–2.8(–3) mm, hirsutulous. Seeds 14–18.
Phenology: Flowering Mar–May.
Habitat: Prairies, roadsides, and woodlands.
Elevation: 0–500 m.
Distribution
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N.Mex., Okla., Tex.
Discussion
Variety trichocarpus is widespread in eastern and southern Texas, but is not clearly distinguished from var. austrinus where their ranges overlap (R. C. Barneby 1964).
Selected References
None.
Lower Taxa
None.