Amorpha roemeriana

Shrubs, 1–3 m; arising from compact, woody root. Stems smooth, gland-dotted, puber­ulent or glabrous. Leaves (5–)10–15(–20) cm; stipules linear, 1.5–2 mm, eglandular, puberulent; petiole (5–)15–30 mm, gland-dotted, usually puberulent; rachis eglandular, usually puberulent; leaflets (7–)9–11(–15), stipels acicular, 1.2–2 mm, petiolule 2–5(–7) mm, usually gland-dotted, puberulent or glabrous, blade usually narrowly elliptic to oblong, rarely obovate to suborbiculate, (10–)25–40(–50) × (7–)15–25(–38) mm, base round, margins flat, entire or conspicuously crenulate, apex round or emarginate, surfaces puberulent abaxially, glabrate or glabrous adaxially; midvein terminated by a slightly swollen mucro, 0.4–0.8 mm. Racemes 1–3(–6)-branched, (4–)6–12(–20) cm; rachis sparsely gland-dotted, puberulent; bracteoles linear to narrowly lanceolate, 1.2–2.2 mm, eglandular, puberulent to short-pilose. Pedicels 1–1.5 mm, eglandular, puberulent. Flowers: calyx tube funnelform, 2.5–3.8 mm, distal 1/3 gland-dotted, short-pilose or glabrous; lobes usually narrowly lanceolate, (0.2–)0.4–1.2(–1.4) mm; banner purple, broadly obcordate, 5–7 × 5–6 mm, indistinctly clawed, margins entire or slightly erose; filaments 6–10 mm, connate basally 4–6 mm; anthers yellow; ovary glabrous. Legumes sessile, 6–7 × 2.5–3.5 mm, margins curved outward abaxially, straight or bent inward adaxially, at least distal 1/2 gland-dotted, glabrous or slightly hairy. Seeds brown, reddish brown, or greenish brown, 2.5–4.5 × 1.5–2 mm, smooth, not lustrous.

Phenology: Flowering Apr–Jun.
Habitat: Grasslands and open woodlands on limestone soils.
Elevation: 400–800 m.

Distribution

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Tex., Mexico (Coahuila).

Discussion

In the flora area, Amorpha roemeriana is confined to the Edwards Plateau area of central Texas, where it occurs in Bandera, Bexar, Blanco, Comal, Gillespie, Hays, Kendall, Kerr, Kinney, Medina, Travis, and Uvalde counties.

Selected References

None.

Lower Taxa

None.