Herbs to 10 dm, eglandular. Stems striate, sparsely pubescent or glabrous. Leaves pinnately 3-foliolate; stipules narrowly oblong, 10–13 mm; petiole 10–35 mm; leaflet blades elliptic to oblanceolate, 37–55 × 15–30 mm, surfaces eglandular, glabrate. Peduncles 4–10 cm. Inflorescences ovoid, 1–2 cm. Flowers 10–11 mm; calyx 6–8 mm, eglandular, sparsely pubescent; corolla color unknown, banner elliptic. Legumes unknown. Seeds unknown.

Phenology: Flowering Jun.
Habitat: Flood-scoured riverbank bedrock, gravel bars, limestone barrens and glades.
Elevation: 100–150 m.

Distribution

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Ky.

Discussion

Orbexilum stipulatum is known only by collections from Rock Island, a locality just below the falls of the Ohio River where it descends into the state of Kentucky. First collected by C. W. Short in 1841, it was last collected in 1881 and now is presumably extinct (C. A. McCormick 2007). J. W. Grimes (1990) placed it in Orbexilum, but placement is uncertain since fruits are unknown (P. A. Rydberg 1928).

Selected References

None.

Lower Taxa

None.