Flora of North America species comparison

procumbent to ascending.

prostrate, decumbent, or semi-erect.

blades cuneate, obovate, or obcordate, 8–25 × 7–20 mm, margins serrate on distal 1/3, often with conspicuous central, purple-red (anthocyanin) blotch adaxially.

blades elliptic, ovate, or obovate, 10–20 × 6–15 mm, margins serrate on distal 1/2.

(1 or)2–5(–8)-flowered, racemes.

(5–)15–50-flowered, cylindrical heads.

4–5(–6) mm;

calyx pubescent, hairs eglandular, sometimes multicellular and gland-tipped, lobes equal to or longer than tube;

corolla yellow, 2 times length of calyx.

2–4 mm;

calyx pubescent, hairs eglandular or glandular, lobes equal to tube;

corolla yellow, 2 times length of calyx.

with 3–5(–7) coils, shortly ellipsoid to subglobose (ends rounded), or discoid to cylindriform (ends flattened), (4–)5–9 × (4–)5–7(–8) mm, glabrous, margin usually prickly, sometimes tuberculate, prickles, when present, often relatively thin and flexible, base 2-rooted, 1 root arising in dorsal suture, other in submarginal vein;

faces soft, coil face with venation anastomosing considerably on outer 1/3, coil edge in end view shows central groove flanked by lateral grooves to form pattern of 3 grooves separating 4 ridges, not visible in side view of coil.

± ovoid, 2–3.5 × 1 mm, covered with eglandular hairs, sometimes also gland-tipped hairs when young;

face with somewhat fusing, prominent veins sometimes appearing as ridges from ventral suture obliquely to dorsal suture.

2+, yellow or yellow-brown, reniform, 2–3.5 × 1.2–1.5 mm;

radicle usually slightly more than 1/2 seed length.

1, yellow to olive green, oval to reniform, 1.5–2 × 1–1.15 mm.

margins deeply dentate to lobed.

margins entire or irregularly toothed.

= 16.

= 16, 32.