Shrubs or small trees. Twigs tomentose. Leaves: petiole 10–34 mm, tomentose, hairs pale brown to rusty brown; blade dull green abaxially, usually darker green adaxially, coriaceous, thickened (0.15–0.3 mm), blades cordate to orbiculate, 24–76 × 39–85 mm (averaging 59 × 56 mm), base nearly truncate to cordate, sinus 4–14 mm deep, margins sinuate, apex obtuse to retuse, surfaces tomentose abaxially, sparsely hairy adaxially. Pedicels sparsely hairy. Flowers: calyx 5.5–7.6 mm wide; banners 4.4–6.5 × 3–5.3 mm, wings 4.8–7.1 × 3.2–4.3 mm, keel 6.5–9.5 × 4.3–6.2 mm. Legumes dull brown, 48–89 × 8–19 mm, sparsely hairy.

Phenology: Flowering Mar–Apr.
Habitat: Limestone hills, bluffs, forests, forest edges.
Elevation: 300–1500 m.

Distribution

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Tex., Mexico (Coahuila, Nuevo León, San Luis Potosí).

Discussion

Subspecies mexicana is known from the Big Bend region of Texas and is found in Brewster, Crockett, Pecos, Terrell, and Val Verde counties. It is common in xeric environments and is characterized by dull, undulate leaves, and by petioles, leaves, and reproductive structures densely covered with hairs.

Selected References

None.

Lower Taxa

None.