Flora of North America species comparison

slender, 0.2-0.8 mm thick.

erect or nearly erect, 10-50 cm, glabrous, each with 9-40 flowers.

glabrous.

laminate and filiform-dissected; laminate leaf blades reniform in outline, deeply 3-parted, 0.5-0.8 × 0.9-1.5 cm, segments elliptic or obovate, margins sometimes notched;

filiform-dissected leaves sometimes few and inconspicuous, stipules gradually tapering upward, connate for whole length, mostly petiolate.

persistent, blades reniform, outer undivided, inner 3-lobed to 3-foliolate, 1-3.5 × 1.5-4.5 cm, base truncate or cordate, margins crenate, apex rounded or obtuse.

pedicels pubescent or glabrous;

receptacle sparsely pilose;

sepals 2-3 × 1-2 mm, abaxially sparsely hispid, hairs colorless;

petals 5, 1-2 × 0.5-1 mm;

nectary scale glabrous.

receptacle glabrous;

sepals spreading, 2-3 × 1-1.5 mm, glabrous;

petals 5, 4-6 × 2-5 mm;

style 1-1.5 mm.

recurved.

globose to ovoid, 3-7 × 3-5 mm;

achenes 1.5-2 × 1.4-1.8 mm, glabrous;

beak slender, strongly curved, 0.6-1 mm.

hemispheric, 3 × 4-5 mm;

achenes 2-2.4 × 1.4-1.8 mm, glabrous;

beak deciduous, sometimes leaving stub to 0.2 mm.

= 16.