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.

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.

cordate in outline, ternately 1-2x-compound, 1.5-3.8 × 2.1-3.8 cm, leaflets 2-3x-parted, ultimate segments elliptic to linear, margins entire or with occasional teeth, apex obtuse to acuminate.

receptacle glabrous;

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

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

receptacle hispid;

sepals spreading, 9-15 × 5-9 mm, glabrous;

petals pinkish white, 12-18 × 9-13 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.

roots absent.

roots absent.

heads globose or depressed-globose, 13-27 × 21-29 mm;

fruit wall veined, inflated, not winged, fruits thus utricles;

utricles 6-12 × 4-6 mm, glabrous;

beak persistent, deltate or subulate from deltate base, 0.2-0.6 mm.

= 32.