Flora of North America species comparison

glabrous or sparsely floccose-tomentose when young.

arachno-tomentose to sericeous-lanate (especially on abaxial faces of phyllaries), unevenly glabrescent.

single or loosely clustered.

single (turgid).

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).

evenly distributed (proximal withering before flowering);

subsessile or petiolate;

blades obovate to oblanceolate, 5–15(–25) × 2–6(–10) cm, bases tapered, margins serrate-dentate to denticulate or subentire (distal leaves slightly smaller).

± 8;

corolla laminae 9–15 mm.

usually ± 21, rarely 0;

corolla laminae 20–25 mm.

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

± 21, 8–15 mm (sometimes purplish or pinkish-tinged), tips greenish.

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

of 6–10 linear bractlets (longest nearly equaling phyllaries).

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

1–5(–15+) in corymbiform arrays (involucres notably large, 20–40 mm diam.).

glabrous.

glabrous.

= 40, 80.

= 40.