Flora of North America species comparison

never tuberous.

never tuberous.

erect or decumbent, sometimes rooting nodally, hispid or strigose, base not bulbous.

erect to reclining, not rooting nodally, hirsute or sometimes pilose or glabrous, base not bulbous.

blades ovate to deltate in outline, 3-foliolate or outer blades merely 3-parted, 2-13.4 × 2.4-16.8 cm, leaflets undivided to lobed or parted, ultimate segments narrowly elliptic or oblanceolate to circular, margins toothed, apex acuminate to rounded.

blades broadly ovate to semicircular or reniform in outline, 3-parted or -foliolate, 1.5-5.3 × 2.2-8 cm, segments usually again 1(-2)×-lobed, ultimate segments oblong or elliptic to lanceolate or oblanceolate, margins dentate (sometimes dentate-lobulate or entire), apex acute to rounded-obtuse.

receptacle hispid;

sepals spreading or reflexed, 4-10 × 2-5 mm, hispid;

petals 5, yellow, 8-16 × 3-9 mm.

receptacle glabrous;

sepals reflexed 2-3 mm above base, 4-7(-9) × 2-4 mm, hirsute;

petals 5-14, yellow, 5-13 × 1.5-8 mm.

hemispheric to short-ovoid, 6-10 × 7-10 mm;

achenes 2.2-5.2 × 2-3.8 mm, glabrous, margin forming narrow rib or broad wing 0.1-1.2 mm wide;

beak persistent, lance-subulate, straight or somewhat curved, 0.8-2.6 mm.

hemispheric, 3-7 × 5-9 mm;

achenes 2.6-3.6(-4.8) × 1.8-3(-3.2) mm, glabrous, rarely hispid, margin forming narrow rib 0.1-0.2 mm wide;

beak persistent, lanceolate to lance-subulate, straight or curved, 0.4-2.2 mm.