Flora of North America species comparison

glabrous or sparsely floccose-tomentose when young.

loosely arachno-tomentose, unevenly glabrescent.

single or loosely clustered.

single or clustered.

evenly distributed; petiolate;

blades narrowly triangular, (3–)4–10+ × 2–6 cm, bases usually ± truncate, sometimes tapered, margins usually dentate, rarely subentire (distal leaves subsessile, smaller).

progressively reduced distally; weakly petiolate;

blades lanceolate to narrowly oblanceolate, 10–18+ × 1–2(–3+) cm, bases tapered, margins entire or wavy (often with dark, cartilaginous denticles; mid leaves similar, smaller, sessile; distal leaves bractlike).

± 8;

corolla laminae 9–15 mm.

± 13;

corolla laminae (5–)15–20 mm.

(± 8) ± 13 (± 21), 6–10 mm, tips usually green, rarely black.

± 21, 9–12(–14) mm, tips not notably blackened (short-hairy).

of 2–6 bractlets (rarely more than 2 mm).

of 5–8+ linear to filiform bractlets (lengths 1/2–7/8+ phyllaries).

10–30(–60) in corymbiform to subracemiform arrays.

usually 1 (sometimes subtended by 1–2 smaller heads).

glabrous.

glabrous.

= 40, 80.

= 40.