Flora of North America species comparison

erect.

erect.

mostly alternate;

petioles 5–20 mm;

blades ovate to rounded-deltate, 20–35(–50) × 18–30(–45) mm, bases broadly cuneate to ± truncate, margins toothed, abaxial faces ± densely tomentulose (between veins), adaxial faces sparsely tomentulose, glabrescent.

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 0–3 mm;

involucres ± cup-shaped, 3–5 mm diam., tomentulose;

florets 12–20+.

peduncles 0.5–2 mm;

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

florets 5–15(–30+).

clustered, proximal to staminates;

florets 2(–3).

clustered, proximal to staminates;

florets 1.

bodies obconic to fusiform, 4–6 mm, tomentulose (little, if at all, stipitate-glandular), spines 15–20+, scattered or on distal 1/2, ± subulate (the proximal basally flattened), 2–3 mm, tips usually uncinate, sometimes straight.

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.

= 72.

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