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 alternate;

petioles 10–35 mm;

blades lanceolate to narrowly triangular, 50–150+ × 18–55+ mm, bases truncate to cordate, margins coarsely toothed (not spiny), abaxial and adaxial faces ± hirsutulous and gland-dotted.

peduncles 0.5–2 mm;

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

florets 8–25(–50).

peduncles 2–4(–12) mm;

involucres ± saucer-shaped, 4–6+ mm diam., ± hirsutulous;

florets 40–60+.

clustered, proximal to staminates;

florets 1.

clustered on lateral axes, proximal to staminates;

florets 4–5.

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 ± fusiform, 6–8+ mm, stipitate-glandular, spines 60–80+, scattered, subulate, 4–6 mm, tips uncinate.

= 36.

= 36.