Flora of North America species comparison

tuberous.

not thickened basally, glabrous or somewhat canescent proximally.

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

erect or ascending, rooting at proximal nodes, glabrous or sparsely hirsute.

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.

lanceolate, 5.9-12.2 × 1.1-2.4 cm, base rounded-obtuse to acuminate, margins denticulate, apex acuminate.

bracts linear or lanceolate.

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

petals 5, 5-8 × 2-3 mm;

nectary scales glabrous.

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.

short-ovoid to depressed-globose, 5-7 × 4-8 mm;

achenes 1.8 × 1.2-1.4 mm, glabrous;

beak lanceolate, straight, 0.6-1.2 mm.

= 32.