Flora of North America species comparison

usually procumbent, sometimes ascending.

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

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

2–4 mm;

calyx pubescent, hairs eglandular, lobes mostly equal to 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.

coiled, dorsal suture prickly, tuberculate, or smooth, coils rarely paper-thin at dorsal suture.

epulvinate.

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

radicle usually slightly less than 1/2 seed length.

smooth;

radicle mostly 1/2(–2/3) seed length.

margins dentate, incised, or lacerate.

= 14.