Flora of North America species comparison

erect.

erect.

mostly alternate;

petioles 3–35 mm;

blades deltate to rounded-deltate, 10–35(–80) × 10–30(–70) mm, bases cordate to truncate, margins coarsely toothed, abaxial faces densely puberulent (including veins), adaxial faces strigillose to scabrellous and gland-dotted.

proximally opposite, distally alternate;

petioles 0–25 mm (often ± winged);

blades deltate to lanceolate, 20–60(–140) × 8–35(–50+) mm, pinnately toothed to 1-pinnately lobed, bases cuneate to truncate, ultimate margins entire or toothed, abaxial and adaxial faces hirsutulous to strigose and gland-dotted.

peduncles 0–1 mm;

involucres cup-shaped, 2–3(–5) mm diam., strigillose;

florets 8–30+.

peduncles 0.5–2 mm;

involucres obliquely cup-shaped, 2–4(–5) mm diam., hirsutulous;

florets 5–15(–30+).

clustered, proximal to staminates;

florets (1–)2.

clustered, proximal to staminates;

florets 1.

bodies ± globose to fusiform, 3–4+ mm, tomentulose and stipitate-glandular, spines 8–20+, scattered, ± subulate (basally navicular), 1–2 mm, tips straight or uncinate.

bodies ± obpyramidal to globose, 2–3 mm, hirsutulous, spines or tubercles 0 or 1–6, mostly distal, stoutly conic to acerose, (0.1–)0.5–1 mm, tips straight.

= 18, 27, 36, 45, 54, 63, 72, 100–104, 108, 144.