Herbs, annual, forming low mats or low thickets, to 0.5–1.8 m diam. Stems straight, rarely from woody rootstock. Leaves 1.5–5 cm; stipules pale green becoming brownish or yellowish, 3+ times as long as wide; petiole (2–)2.5–5(–6.5) mm; extrafloral nectary 1(–3), subsessile or shortly stipitate, very small; leaflets 8–17(or 19) pairs, blades semi-oblong or -obovate, 3–12 × 0.5–2.8 mm. Racemes 1–3-flowered, axillary. Pedicels 5–15 mm; bracteoles distal to mid pedicel. Flowers: calyx brownish or yellowish, sepal venation reticulate; corolla yellow, petals usually very unequal, to 9–17(–19) mm; stamens 10; anthers red, (5.5–)6.5–9(–11) mm; ovary hairy, hairy along sutures, or glabrous. Legumes straight, usually linear, (25–)30–65 × 4–5 mm. Seeds 3.4–4.3 mm.

Phenology: Flowering summer–early fall.
Habitat: Dunes, beaches, associated sandy flats.
Elevation: 0–10 m.

Distribution

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Tex., Mexico (Tamaulipas).

Discussion

Variety cruziana has been found along the Texas Gulf coast from Aransas County southward along the coast into Mexico to the Tamaulipas/Veracruz border (H. S. Irwin and R. C. Barneby 1982).

Selected References

None.

Lower Taxa

None.