Flora of North America species comparison

erect or reclining, hispid or sometimes glabrous.

erect, glabrous, rooting at base, only very rarely rooting at proximal nodes.

basal and cauline, basal and proximal cauline leaf blades reniform to semicircular in outline, 3-lobed or -parted, 1-5 × 1.6-6.8 cm, base truncate to cordate, segments usually again lobed or parted, sometimes undivided, margins crenate or crenate-lobulate, apex rounded or occasionally obtuse.

pedicellate;

receptacle hispid;

sepals 5, reflexed, 3-4 × 2 mm, sparsely hispid;

petals 5, 4-5 × 2-3 mm.

receptacle pubescent or glabrous;

sepals 3-5, reflexed from or near base, 2-5 × 1-3 mm, glabrous or sparsely hirsute;

petals 3-5, 2-5 × 1-3 mm;

nectary on petal surface, scale poorly developed and forming crescent-shaped or circular ridge surrounding but not covering nectary;

style absent.

ovoid, 8-9 × 6-7 mm;

achenes 30-60 per head, 2 × 2 mm, faces densely tuberculate, glabrous, margin smooth;

beak semicircular, hooked, 0.3 mm.

ellipsoid or cylindric heads, 5-13 × 3-7 mm;

achenes 1-1.2 × 0.8-1 mm, glabrous;

beak deltate, usually straight, 0.1 mm.

and lower cauline leaf blades cordate-ovate, 3-foliolate, 5-8 × 3-6(-7) cm, leaflets again cleft or parted, leaflet base obtuse to acute, margins dentate, apex rounded to acute.