Flora of North America species comparison

erect to decumbent, sparsely leafy, leaves distributed throughout, well branched, often sprawling on other plants, 2–11.5 dm, basally usually with 2 lines of minute curved hairs, occasionally glabrous, distally with 2 lines of curved hairs, or evenly puberulent with curved hairs, sometimes also spreading-villous or viscid-villous.

ascending to spreading at 45–90°, abruptly reduced in inflorescence;

petiole 0.5–1.2 cm;

blade green, lanceolate-triangular to ovate-triangular, 2–5 × 1–4.5 cm, thin or slightly thickened and fleshy, base obtuse to round, rarely attenuate, apex acute, sometimes narrowly so, rarely round, surfaces glabrous.

usually terminal, sometimes also with short branches in distal axils, occasionally with single involucres in axils, when terminal, usually with main axis and shorter branches and involucres densely clustered at ends of branches;

peduncle 2–7 mm, spreading-villous, usually with short hairs, sometimes viscid, crosswalls of hairs pale or dark;

involucres pale green, sometimes tinged with red, widely bell-shaped, 4–6 mm in flower, 8–12 mm in fruit, glabrate and puberulent on margins to spreading-villous, sometimes viscid, 50–75% connate, lobes triangular-ovate to round-ovate.

(2–)3 per involucre;

perianth pink to reddish purple, rarely white, 1 cm.

reddish brown, brown, or blackish (ribs and warts usually paler), obovoid, 3.5–5.2 mm, pubescent with tufted hairs from tubercles, sometimes pubescent throughout, hairs 0.1–0.3 mm;

ribs round-angular, 0.5–1 times width of sulci, 0.5–1 times as wide as high, rugose, smooth near base and dissected at apex into tall warts, or dissected throughout;

sulci with prominent round or shelflike, narrow tubercles.