Flora of North America species comparison

usually erect or ascending, occasionally decumbent, leafy mostly in proximal 2/3 of plant, openly forked distally, 4–15 dm, basally usually glabrous or puberulent in 2 lines, rarely spreading-pubescent; distally stems usually puberulent in 2 lines, occasionally glabrate, rarely spreading glandular-pubescent.

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 at 45–80°, abruptly reduced to inflorescence;

petiole 0.2–2 cm;

blade green, ovate-lanceolate to ovate or triangular, 3–10 × 2–6.5 cm, usually ± thin, base obtuse, round, truncate, or cordate, apex acute to acuminate, rarely rounded, surfaces usually glabrous, sometimes puberulent or sparsely hispidulous.

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.

terminal and in upper axils, subumbellate clusters at ends of long, forked branches;

peduncle 5–20 mm, usually pubescent with ascending, often curved, glandular or eglandular hairs, crosswalls of hairs pale;

involucres pale green, often tinged pinkish, widely bell-shaped to almost rotate, 4–6 mm in flower, 8–15 mm in fruit, glabrous or glabrate but with minute curved hairs on margins, or rarely puberulent or pilose throughout, 50–90% connate, lobes ovate to broadly ovate.

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(–5) per involucre;

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

(2–)3 per involucre;

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

dark grayish brown to reddish brown (ribs and tubercles usually slightly paler), narrowly obovate and tapering at both ends, 3.4–5 mm, shaggy-pubescent with spreading, sometimes tufted, hairs, 0.3–0.4 mm, sometimes also with layer of minute hairs;

ribs usually irregularly and deeply notched, especially toward apex, round to bluntly angled, 0.5–0.75 times width of sulci, 0.5–1 times as wide as high;

sulci with pale small to tall tubercles that are sometimes horizontally lengthened and shelflike.

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.

= 58.