Flora of North America species comparison

usually procumbent, sometimes ascending.

procumbent to ascending.

blades obovate to obcordate, 2–7(–12) × 2–5(–10) mm, margin serrate on distal 1/3.

blades cuneate to obovate, 8–15 × 7–12 mm, margins serrate on distal 1/2, rarely incised or laciniate.

1- or 2-flowered, usually 1 ripe pod remaining on peduncle, umbels or racemes.

1–3(–5)-flowered, racemes.

2–4 mm;

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

corolla yellow, slightly longer than calyx.

6–8 mm;

calyx pubescent, hairs eglandular, lobes longer than tube;

corolla yellow, less than 2 times length of calyx.

with 2.5–4(–5) coils, short-cylindrical, 2–4(–5) × 2–3 mm, usually pubescent with eglandular hairs, rarely glabrescent, margin prickly, prickles often relatively thin and flexible, base 2-rooted, 1 root arising in dorsal suture, other in submarginal vein;

faces soft, coil face with very strongly curving radial veins that branch slightly and enter broad lateral vein near dorsal suture.

with 2.5–8 coils, coils often strongly adpressed, usually cylindrical, 6–12 × 7–12 mm, often pubescent, sometimes glabrescent, hairs eglandular, margin usually prickly, rarely prickleless, prickles often at 90° to plane of coil, pointed to ends of pod, very stocky and difficult to bend, base often round, 2 roots often apparent at maturity;

faces very hard at maturity, coil face with slightly branched and anastomosing veins, veins weakly to moderately curved.

yellow or brownish yellow, reniform, 1.7–2.4 × 0.9–1.3 mm;

radicle usually slightly less than 1/2 seed length.

2–25, yellow or brownish yellow, reniform, 2.5–4.5 × 1.3–2.5 mm;

radicle less than 1/2 seed length.

margins dentate, incised, or lacerate.

margins deeply dentate to laciniate.

= 14.

= (14) 16.