Herbs, perennial, to 0.6 m. Leaves slightly sclerophyllous, 5–10 cm, dull glaucescent, sparsely hairy; stipules cadu­cous, 1–3 mm wide; extrafloral nectaries between all leaflet pairs, stipitate; leaflet pairs 3–6, blades oblong- or ovate-elliptic, 15–40 ×7–13 mm. Racemes usually 5–25-flowered; bracts caducous. Pedicels 0–5 mm. Flowers monosymmetric (similar to S. lindheimeriana but smaller); calyx usually pale green, rarely yellow; corolla yellow, longest petal 8–10.5 mm; androecium heterantherous, stamens 7, staminodes 3; anthers 3–5 mm, dehiscing by 1 apical pore, apical appendage 0; gynoecium linear, ovules unknown; ovary densely hairy; style incurved. Legumes erect, flat, straight or slightly incurved, 40–120 × 3.5–6.5 mm, shallowly corrugated over seeds, dehiscent. Seeds brown, obovoid or oblong-obovoid.

Phenology: Flowering spring–summer.
Habitat: Stony hillsides, canyon floors.
Elevation: 1300–1800 m.

Distribution

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N.Mex., Tex., Mexico (Chihuahua, Coahuila).

Discussion

Selected References

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Lower Taxa

None.