Flora of North America species comparison

prostrate or decumbent.

erect.

mostly alternate;

petioles 15–30(–45+) mm;

blades rounded-deltate to ovate or obovate, 20–45(–70+) × 10–25(–50+) mm overall, not lobed or 1–2(–3)-pinnately lobed, bases cuneate, ultimate margins entire or toothed, abaxial and adaxial faces strigillose to sericeous.

mostly opposite;

petioles 10–30(–70+) mm;

blades rounded-deltate to ovate or elliptic, 40–150(–250+) × 30–70(–200+) mm, usually some blades palmately 3(–5)-lobed, bases truncate to cuneate (sometimes decurrent onto petioles), margins usually toothed, rarely entire, abaxial and adaxial faces ± scabrellous and gland-dotted.

peduncles 0.5–2 mm;

involucres shallowly cup-shaped, 4–6+ mm diam., strigillose;

florets 8–25(–50).

peduncles 1–3+ mm;

involucres ± saucer-shaped, 2–4 mm diam., scabrellous (often with 1–3 black nerves);

florets 3–25+.

clustered, proximal to staminates;

florets 1.

clustered, proximal to staminates;

florets 1.

bodies fusiform to ± pyriform, 4–7+ mm, ± strigillose to pilosulous, spines 8–16+, scattered, stoutly conic or flattened- to triquetrous-subulate, 0.5–1.5+ mm, tips straight.

bodies ± pyramidal, 3–5(–7+) mm, glabrous or glabrate, spines 4–5, ± distal, ± acerose, 0.5–1 mm, tips straight (bases ± decurrent as ribs).

= 36.

= 24, 48.