Flora of North America species comparison

slender, 0.4-1 mm thick.

erect, sparsely pilose.

erect from short caudices, 3-20 cm, sparsely pilose to glabrous, each with 1-3 flowers.

persistent, blades transversely elliptic to orbiculate, 1-3 × 1-3 cm, base obtuse to nearly truncate, margins crenate or else blades shallowly 3-lobed with crenate lateral lobes, apex rounded or rounded-apiculate.

reniform to semicircular, undivided or shallowly 3-lobed, 2.5-5 × 3-7 cm, base truncate to nearly cordate, margins crenate or dentate, apex rounded or obtuse.

pedicellate;

receptacle hispid;

sepals 5, reflexed 1 mm from base, 3-5 × 1-2 mm, hispid;

petals 5, 4-5 × 2-3.5 mm.

pedicels sparsely brown-pilose;

receptacle brown-pilose;

sepals 6-8 × 3-6 mm, abaxially densely brown-hispid;

petals 5(-6), 8-12 × 6-10 mm;

nectary scale glabrous.

hemispheric to globose, 4 × 6 mm;

achenes 15-20 per head, 2.5-3 × 2-2.5 mm, faces covered with high sharp tubercles or low spines, glabrous, margin smooth;

beak deltate, straight, 0.8-1 mm.

ovoid-cylindric or ovoid, 6-7(-9) × 5-6 mm;

achenes 1.8-2.2 × 1.4-1.8 mm, glabrous or sparsely brown-hispid;

beak slender, straight or curved, 0.8-1.4 mm.

= 42, ca. 80, ca. 84, 96, ca. 98.