Flora of North America species comparison

procumbent, decumbent, or ascending.

usually procumbent, sometimes ascending.

blades obovate, obcordate, or cuneate, 8–20 × 7–18(–20) mm, margins usually serrate, rarely laciniate, on distal 1/3–1/2.

blades obovate to cuneate, 7–13 × 5–10 mm, margins serrate on distal 1/3–2/3.

(1 or)2–6(–10)-flowered, racemes.

1- or 2(–5)-flowered, racemes, usually 1 pod developing on each peduncle.

3.5–6 mm;

calyx sparsely pubescent, hairs eglandular, lobes equal to tube;

corolla yellow, usually less than 2 times length of calyx.

3–4(–6) mm;

calyx glabrous or sparsely hairy, hairs eglandular, lobes equal to tube;

corolla yellow, to 2 times length of calyx.

with 1.5–7 coils, discoid, short to long cylindrical, or conical-truncate, 2–12 × 4–10 mm, usually glabrous, margin usually prickly, sometimes tuberculate or prickleless, prickles, when present, often relatively thin and flexible, base 2-rooted, 1 root arising in dorsal suture, other in submarginal vein;

faces moderately soft, sometimes very hard at maturity, coil face with transverse veins anastomosing in outer part of coil before entering lateral vein near coil edge.

with (2–)3–7 coils, lenticular or discoid, 5–10 × 8–20(–24) mm, coil edges papery at margins, glabrous, glabrescent, sometimes hairs gland-tipped;

coil face with fusing radial veins, often thickened at coil margin.

2–12, light yellow to brownish, reniform, 2–4 × 1.5–2.2 mm;

radicle 1/2 seed length.

9–30, yellow, brownish yellow or reddish brown, triangular, 2.5–3 × 2.5–3 mm.

margins laciniate.

margins laciniate.

= 14, 16.

= 16.