Flora of North America species comparison

of the latter are characterized as shrubs or creeping herbs, the stems with long, yellow-brown, spreading hairs (versus shorter, more appressed hairs in subsp. incana), inflorescence bracts usually 4–10 (versus 1–3) mm, and calyx lobes pilose (versus glabrate).

suffrutescent basally, erect, 50–150 cm, glabrous.

unifoliolate;

stipules ovate to ovate-lanceolate, not decurrent on stem, 4–7 mm;

blade obovate to elliptic, 50–150 mm, length 1.5–2.5 times width, surfaces glaucous, strigose abaxially, glabrous-punctate adaxially.

12–22-flowered, terminal, subterminal, or lateral, 10–50 cm;

bracts persistent, cordate-auriculate, 5–8 mm.

calyx broadly cylindrical, 10–15 mm, lobes triangular-lanceolate, glabrous;

corolla bright yellow, faintly red-lined, 17–25 mm.

30–45 × 10–20 mm, glabrous.

subspecies of Crotalaria incana are native to southeast Africa, where they are partially sympatric.

purpurascens (Lamarck) Milne-Redhead occurs also in Madagascar.

= 16.