Flora of North America species comparison

tuberous.

always both filiform and tuberous on same stem.

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

erect or ascending, never rooting nodally, strigose or spreading-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.

ovate to broadly ovate in outline, 3-5-foliolate, 2.1-4.7 × 1.9-4.5 cm, leaflets undivided or 1x-lobed or -parted, ultimate segments oblanceolate or obovate, margins entire or with few teeth, apex rounded-acute to rounded-obtuse.

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 hispid or glabrous;

sepals spreading or sometimes reflexed from base, 5-7 × 2-3 mm, hispid or glabrous;

petals 5(-7), yellow, 8-14 × 3-6 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.

globose or ovoid, 5-9 × 5-8 mm;

achenes 2-2.8 × 1.8-2.2 mm, glabrous, margin forming narrow rib 0.1-0.2 mm wide;

beak persistent, filiform, straight, 1.2-2.8 mm.

= 32.

= 32.