Flora of North America species comparison

never tuberous.

thickened basally, glabrous.

erect or reclining, never rooting nodally, hispid or glabrous, base not bulbous.

prostrate, sometimes rooting nodally, glabrous.

broadly triangular to cordate in outline, 3-foliolate, 6-13 × 8-16 cm, leaflets lobed, margins toothed, ultimate segments elliptic to lance-elliptic or oblong, margins toothed, apex acute or obtuse.

narrowly to broadly ovate, 1.2-4 × 0.7-2 cm, base rounded, truncate or sometimes obtuse, margins entire or denticulate, apex obtuse or acute.

bracts ovate or sometimes lanceolate.

receptacle hispid;

sepals reflexed 1-2 mm above base, 6-9 × 3-4 mm, sparsely hispid;

petals 5, abaxially yellow or purplish, adaxially yellow, 9-11 × 6-8 mm.

receptacle glabrous;

sepals 5, spreading or reflexed from near base, 2-4 × 1-3 mm, glabrous;

petals 5-6, 4-6 × 2-4 mm;

nectary scales glabrous.

ovoid to globose, 9-11 × 8-11 mm;

achenes 3.2-3.8 × 2-3 mm, glabrous, margin forming narrow rib 0.1-0.2 mm wide;

beak persistent, lanceolate or subulate from triangular base, straight or tip weakly hooked, 1-1.8 mm.

hemispheric, 2-3 × 3-4 mm;

achenes 1.2-2 × 1.2-1.4 mm, glabrous;

beak lanceolate to subulate, straight or curved, 0.6-0.8 mm.