Flora of North America species comparison

never tuberous.

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

erect to decumbent, never rooting nodally, hirsute, pilose, 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.

ovate to narrowly ovate in outline, 3-parted or -foliolate, 3.3-9.5 ×3.5-9.4 cm, leaflets or segments 1-3x-lobed, ultimate segments ovate or oblong-ovate to lanceolate, 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 glabrous;

sepals reflexed 1-2 mm above base, 3-8 × 2-4 mm, hirsute;

petals 5-17, yellow, 6-12 × 3-6 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, 6-9 × 7-10 mm;

achenes 3.4-4.4 × 2.4-3.6 mm, glabrous or rarely hispid, margin forming narrow rib 0.1-0.2 mm wide;

beak persistent, deltate or lance-deltate, curved, 0.2-1.2 mm.

roots absent.

= 32.