Flora of North America species comparison

thickened basally, glabrous.

erect or ascending, never rooting nodally, glabrous.

erect, sparsely pilose.

basal leaf blades with base obtuse to cordate;

proximal cauline leaf blades semicircular to cordate or ovate, 1.2-5.1 × 1.5-2.9 cm, base cordate to broadly obtuse, margins entire or crenulate, apex broadly acute to rounded.

blades 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.

bracts narrowly elliptic to ovate or lanceolate.

receptacle glabrous or hispidulous;

sepals 4-5, spreading or reflexed from base, 3-5 × 2-4 mm, glabrous;

petals 5-6, 4-9 × 2-5 mm;

nectary scales glabrous.

pedicellate;

receptacle hispid;

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

petals 5, 4-5 × 2-3.5 mm.

hemispheric, 3 × 4-5 mm;

achenes 1.6-1.8 × 1.2 mm, glabrous;

beak lance-subulate, straight, 0.2-1 mm.

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.