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 obovate to oblong-cuneate, 5–10 × 2–5 mm, margins laciniate, incised-dentate, incised-pinnatifid, or serrate to deeply serrate on distal 1/2, laciniate and non-laciniate leaves often on same plant.

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

1- or 2(or 3)-flowered, racemes.

2–4 mm;

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

corolla yellow, slightly longer than calyx.

3–6(–8) mm;

calyx pubescent, hairs eglandular, lobes shorter than tube;

corolla pale to dark 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 3–7(–9) coils, short-cylindrical, spherical, or ovoid, 3–8(–10) × 2.5–6 mm, usually glabrous or glabrescent, rarely pubescent with eglandular hairs, very rarely with glandular hairs, 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 S-shaped (sigmoid) radial veins, some branched, that enter broad lateral vein near dorsal suture, veinless area occupying outer 1/5 of coil face.

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

radicle usually slightly less than 1/2 seed length.

3–14, yellow to yellow-brown, reniform, 2–3 × 1–1.5 mm;

radicle 1/2–2/3 seed length.

margins dentate, incised, or lacerate.

margins deeply dentate to laciniate.

= 14.

= 16.