Flora of North America species comparison

1 or 2–5+, clustered, lanate- or arachno-tomentose or glabrescent.

1, glabrous or leaf axils sparsely tomentose.

(often abaxially cyanic) petiolate (petioles hairy to glabrate);

blades ovate to lanceolate or narrowly lanceolate, 20–60+ × 10–30+ mm, bases abruptly contracted to tapering, margins subentire or denticulate to subserrate (abaxial faces usually tomentose, adaxials frequently glabrate).

(and proximal cauline) petiolate;

blades narrowly ovate to oblong-lanceolate, 30–70+ × 10–20+ mm, bases abruptly contracted to subcordate, margins usually serrate-dentate, sometimes subcrenate (apices acute).

gradually or abruptly reduced (proximal petiolate, similar to basals; mids and distals sessile, lanceolate, entire).

gradually reduced (± sessile; lacerate to subcrenate).

conspicuously bracteate, usually hairy.

bracteate, glabrous.

(5–)8 or 13;

corolla laminae 4–10 mm.

8–13;

corolla laminae 4–7 mm.

40–60+;

corolla tubes 1.5–2.5 mm, limbs 3.5–4.5 mm.

50–70+;

corolla tubes 3.5–4 mm, limbs 3–3.5 mm.

13 or 21, green or yellowish, 4–7+ mm, tomentose to glabrescent.

13 or 21, light green (tips sometimes black), 5–8 mm, glabrous.

conspicuous.

conspicuous.

3–20+ in open or compact, corymbiform to subumbelliform arrays (subtended by smaller arrays arising from leaf axils).

8–20+ in loose, corymbiform arrays.

1.5–2.5 mm, usually hirtellous on ribs, sometimes glabrous;

pappi 5–6+ mm.

1–1.5 mm, glabrous;

pappi 5–5.5 mm.

= 44, 46, 92.

= 44.