Astragalus oophorus var. caulescens

Leaflets 9–19(–25). Flowers 17–21 mm; calyx campanulate or short-cylindric, often sparsely black-strigulose, sometimes gla­brous, tube 4.5–6 × 3.3–5.5 mm, lobes 2.3–6(–7.7) mm; corolla usually ochro­leucous (concolorous), rarely banner and wings suf­fused with purple, or purple throughout. Legumes asymmetric, semi-ovoid or semi-ellipsoid, (25–)30–40(–45) mm, sutures gently concave ventrally, straight or strongly convex in profile; gynophore 5–9 mm.

Phenology: Flowering May–Jul.
Habitat: Sagebrush, pinyon-juniper, and mountain brush communities.
Elevation: 1300–2500 m.

Distribution

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Ariz., Nev., Utah.

Discussion

As noted by R. C. Barneby (1964), plants with bicolored (purple and white) flowers occur occasionally within the range of var. caulescens in Mohave County, Arizona. From near the southern limit of the variety in Arizona, plants sometimes have petals suffused or lined with lilac. Plants from the Arizona plateaus also tend to have more numerous leaflets (to 21–25) than found else­where within the variety, and the fruit is generally less oblique in outline and with a shorter, less well-defined beak.

Selected References

None.

Lower Taxa

None.