Herbs, perennial; root turnip-shaped. Stems prostrate, solid, hirsute. Leaves: stipules spread­ing, ovate-lanceolate, 2.3–6.2 × 1.5–2 mm; petiole 2–5 cm, hirsute; rachis 5–7 mm; stipels subulate or linear, 1–2.5 mm; leaflets leathery, blades linear, base rounded or cuneate, margins entire, apex acute, surfaces densely hispid abaxially, glabrescent adaxially; lateral blades 3.8–4.5 × 0.9–1.1 cm, terminal blades 2.5–4.2 × 0.5–0.8 cm. Inflorescences 11–15 cm, (cleistogamous inflorescence above soil, 3.9–6.3 mm, flowers 6 mm, corolla whitish), axes glabrous; tufts of bracts at base of peduncle mostly caducous; extrafloral nectaries inconspicuous at nodes; bracts and bracteoles subulate. Pedicels 0.6 mm. Flowers 0.9 cm; calyx cam­panulate, 2–2.3 mm, hirsute or glabrescent, calyx lobes as long as the tube or longer; corolla red; banner obovate, 5.3 × 5 mm; wings oblong-ovate, 8.1–8.9 × 3.2–5.4 mm; keel 6.2 mm; ovary nectary disc distally even; ovules 4. Legumes pendent, oblong-falcate, 1 × 0.2–0.3 cm, valves not twisting at dehiscence. Seeds 2 or 3 (or 4), reniform, 1.7–2.3 × 1.2–3.5 mm.

Phenology: Flowering Sep–Nov.
Habitat: Slopes, grasslands.
Elevation: 300–900 m.

Distribution

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Ariz., Mexico (Nayarit, Sonora).

Discussion

In the flora area, Macroptilium supinum is found only in Pima and Santa Cruz counties (A. Delgado-Salinas and L. Torres-Colín 1995).

Selected References

None.

Lower Taxa

None.