Flora of North America species comparison

never tuberous.

creeping or floating, rooting nodally, glabrous, not bulbous-based.

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

linear to obovate, undivided or 3-lobed, 1.5-3.6 × 0.3-2 cm, lobes lanceolate or elliptic, margins entire, apex rounded to acuminate.

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.

receptacle glabrous;

sepals spreading, 6-10 × 4-7 mm, glabrous;

petals 7-11, white or pink, 8-13 × 3-6 mm.

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.

globose or hemispheric, 5-12 × 9-15 mm;

achenes 4.2-5.2 × 2.4-3.2 mm, glabrous;

beak persistent, lanceolate, straight or curved, 1-1.2 mm.

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.

roots absent.

= 32.