Flora of North America species comparison

green (sometimes red-tinged), usually erect, branched mostly distally or ± throughout, glabrous, glabrate, puberulent, or sparsely strigillose to strigoso-sericeous (glabrescent, hairs mostly medifixed) and gland-dotted.

green or reddish, decumbent (sometimes rooting at nodes) or ascending to erect, branched mostly proximally, ± strigoso-sericeous or villous, glabrescent.

blades 25–55 × 15–30 mm, 1–2-pinnately lobed.

blades 15–35 × 8–16 mm, 1–2-pinnately lobed (ultimate lobes triangular to narrowly elliptic or linear).

mostly (2–)4–6(–15) cm.

mostly 4–15 cm (sometimes clavate in fruit).

5–9 mm diam., ± villosulous to arachnose.

6–13 mm diam., ± villous.

paleate mostly distally;

paleae subulate to acerose 2–3+ mm (often gland-dotted).

paleate throughout;

paleae lanceolate to oblanceolate, weakly navicular (± carinate), 3–4+ mm (including acuminate-spinose tips).

10–15, styliferous and sterile;

corollas white, laminae 5–15+ mm.

5–20, pistillate, fertile;

corollas white, rarely tinged with pink, laminae 5–15 mm.

2–2.5 mm (sparsely gland-dotted).

(sometimes tinged with purple) 2–3(–4) mm.

1.3–2 mm, ribs ± tuberculate (furrows often gland-dotted);

pappi 0.

1.7–2+ mm, ribs smooth or weakly tuberculate (sometimes separated by relatively deep furrows);

pappi 0 or coroniform (0.01+ mm).

= 18.

= 18.