Herbs 6–8 dm; with ligneous, often tuberous, taproot or slender rhizome. Stems densely strigose to glabrate. Leaves pinnately 3-foliolate; stipules lanceolate to lin­ear, 6–10 mm; petiole 3–65 mm; leaflet blades lance­olate to elliptic, 20–70 × 6–22 mm, surfaces eglandular or sparsely glandular-punctate, strigose. Peduncles 4–16 cm. Inflorescences columnar, 2–13 cm; bracts lan­ceolate to narrowly ovate, 5–8 × 1–2.5 mm, eglandular. Flowers 5–7 mm; calyx 4–7 mm, eglandular, strigose; corolla violet to purple, banner ovate. Legumes 3–5 × 3–4 mm, eglandular, rugose. Seeds round-obovate, 3–3.5 mm. 2n = 22.

Phenology: Flowering May–Jul.
Habitat: Open woods, grasslands.
Elevation: 200–500 m.

Distribution

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Ala., Ark., Fla., Ga., Ill., Ind., Ky., La., Miss., Mo., Nebr., N.C., Ohio, Okla., S.C., Tenn., Tex.

Discussion

Orbexilum pedunculatum is allopatric with its closest relative, O. psoralioides, and the two taxa show little evidence of intergradation in regions of near contact (R. L. Wilbur 1963b; J. W. Grimes 1990; D. Isely 1990).

The combination Psoralea pedunculata (Miller) Vail (1894), which pertains here, is a later homonym of P. pedunculata Ker Gawler (1817) [= Otholobium sericeum (Poiret) C. H. Stirton (C. H. Stirton 1986)].

Selected References

None.

Lower Taxa

None.