Flora of North America species comparison

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

erect from short caudices, not rooting nodally, glabrous, not bulbous-based.

basal leaf blades ovate to semicircular in outline, ternately or pinnately 2x-compound, 2.4-8.2 × 2-8.5 cm, leaflets parted and again lobed, ultimate segments elliptic to linear, margins entire (or occasionally a lobe reduced to tooth), apex acuminate to rounded.

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.

receptacle glabrous;

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

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

receptacle glabrous;

sepals spreading or reflexed from base, 3-6 × 1-3 mm, glabrous;

petals (0-)5-6, yellow, 3-8 × 1-3 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.

hemispheric to globose, 4-5 × 6-7 mm;

achenes 2.2-3.6 × 1.2-1.8 mm, glabrous;

beak filiform, strongly reflexed from base, 0.8-1.5 mm, brittle, often broken.

roots absent.

roots absent.

= 32.

= 32.