Flora of North America species comparison

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

glabrous.

laminate and filiform-dissected; laminate leaf blades reniform in outline, deeply 3-parted, 0.5-0.8 × 0.9-1.5 cm, segments elliptic or obovate, margins sometimes notched;

filiform-dissected leaves sometimes few and inconspicuous, stipules gradually tapering upward, connate for whole length, mostly petiolate.

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, 2-3 × 1-1.5 mm, glabrous;

petals 5, 4-6 × 2-5 mm;

style 1-1.5 mm.

recurved.

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, 3 × 4-5 mm;

achenes 2-2.4 × 1.4-1.8 mm, glabrous;

beak deciduous, sometimes leaving stub to 0.2 mm.

roots absent.

= 32.