Flora of North America species comparison

tuberous.

never tuberous, sometimes thick and ± fleshy proximally.

erect or decumbent, never rooting nodally, hispid, base not bulbous.

erect, not rooting nodally, hirsute or strigose, base not bulbous.

ovate in outline, 3-5-foliolate, 3.8-10 × 2.7-9 cm, leaflets 1x-lobed, ultimate segments narrowly elliptic to oblanceolate, margins entire or with few teeth, apex broadly acute to rounded-obtuse.

broadly ovate to cordate or sometimes reniform in outline, deeply 3-divided or occasionally 3-foliolate, 2.2-6 × 2.5-7.7(-10) cm, divisions 1-2x deeply parted or -dissected, ultimate segments linear to broadly linear, margins entire (occasionally a lobe reduced to large tooth), apex acute or rounded-acute.

receptacle hispid;

sepals spreading or weakly reflexed ca. 1 mm above base, 7-10 × 3-5 mm, hispid;

petals 10-22, yellow, 12-22 × 4-9 mm.

receptacle glabrous;

sepals spreading or variously reflexed, 4-6 × 2-4 mm, appressed-hirsute;

petals 5(-10), yellow, 7-13 × 4-10 mm.

globose to cylindric, 8-14 × 8-10 mm;

achenes 2.2-4.2 × 2.8-3.4 mm, glabrous, margin forming narrow rib 0.4-0.6 mm wide;

beak usually persistent, filiform from deltate base, straight, 2-4 mm.

hemispheric or globose, 5-8 × 6-8(-10) mm;

achenes 2.2-3.4 × 2-3 mm, glabrous, margin forming narrow rib 0.1-0.2 mm wide;

beak persistent, lanceolate, strongly curved, 0.4-1.6 mm.

= 32.