Flora of North America species comparison

erect.

erect.

opposite (proximal) and alternate;

petioles 25–35(–60+) mm;

blades deltate to lanceolate or elliptic, 25–55(–90+) × 20–30(–50+) mm, 1–2-pinnately lobed, bases cuneate, ultimate margins entire or toothed, abaxial faces sparsely pilosulous to strigillose, adaxial faces strigillose, both gland-dotted.

mostly alternate;

petioles 0;

blades mostly linear (some 1-pinnate, lobes linear), 12–20(–35+) × 1(–2+) mm, bases cuneate, margins entire, abaxial faces strigillose (whitish), adaxial faces scabrellous.

peduncles 0.5–1.5 mm;

involucres shallowly cup-shaped (usually without black nerves), 2–3+ mm diam., glabrous or hispid to pilosulous;

florets 12–20+.

peduncles 0.5–1 mm;

involucres cup-shaped (with black nerves), 4–6+ mm diam., strigillose;

florets 12–20+.

clustered, proximal to staminates;

florets 1.

clustered, proximal to staminates;

florets 1.

bodies ± globose to pyriform, 2–3 mm, ± pilosulous, spines or tubercles 3–5+, near middles or distal, ± conic to acerose, 0.1–0.5+ mm, tips straight.

bodies pyriform to obconic, 2–4(–5) mm, strigillose, spines (4–)5–9(–13+), scattered or mostly distal, subulate, (0.8–)1–1.5 mm, tips usually uncinate.

= 34, 36.