Flora of North America species comparison

arachnose, loosely tomentose, or villous (hairs crisped, jointed), glabrescent.

glabrous (or with hairs on peduncles).

single.

single (often purplish-tinged).

progressively reduced distally; ± petiolate;

blades elliptic, lanceolate, linear, oblanceolate, rounded-deltate, or suborbiculate, 6–25 × 1–6 cm, bases ± tapered or truncate to cordate, margins entire or ± dentate (distal leaves sessile, bractlike).

mostly basal; petiolate (petioles ± winged, lengths 1–3+ blades);

blades broadly ovate to ovate-orbiculate, (1.5–)2.5–4.5(–6) × 1.5–4(–5) cm, bases truncate or tapered, margins weakly dentate or repand-denticulate to subentire (cauline leaves smaller, bractlike).

usually ± 8 or ± 13, sometimes 0;

corolla laminae 6–15(–20) mm (usually yellow, ochroleucous to white in one variety).

± 13+;

corolla laminae 10–14 mm.

usually ± 13 or ± 21, rarely ± 8, (4–)5–12(–15) mm, tips usually black, sometimes green.

± 21, (8–)10–16 mm, tips green.

of 1–5+ linear to filiform bractlets (seldom more than 2 mm).

of 3–5+ lanceolate to lance-linear bractlets (lengths 1/2–2/3 phyllaries).

6–20(–40+) in corymbiform arrays (peduncle of terminal head often shorter than others).

nodding, 1(–2).

usually glabrous, sometimes hirtellous (mostly on angles).

glabrous.

= 40, 80.