Flora of North America species comparison

usually procumbent, sometimes ascending.

prostrate to ascending.

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

blades obovate, obovate-cuneate, oval, ovate, or globose, (3–)4–10(–13) × (2.5–)3–7(–10) mm, margins usually serrate, sometimes laciniate or incised, on distal 1/2–3/4.

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

4–18-flowered, capitate or subumbellate, with stellate flowers, deflexed fruits.

2–4 mm;

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

corolla yellow, slightly longer than calyx.

3.5–5 mm;

calyx pubescent, hairs eglandular, lobes longer than tube;

corolla yellow, slightly longer than 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.

linear, slightly compressed, 7–15(–25) × 1–2 mm, pubescent or glabrous, margin prickleless;

faces with obliquely transverse, anastomosing, prominent veins.

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

radicle usually slightly less than 1/2 seed length.

4–10, yellow or yellow-brown, rhomboid-ovoid, 1–1.6 × 0.7–1.1 mm.

margins dentate, incised, or lacerate.

margins dentate to incised.

= 14.

= 16.