Flora of North America species comparison

filiform, sometimes enlarged basally, 0.5-1.5 mm thick.

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

erect or nearly erect, 10-60 cm, glabrous, each with 3-50 flowers.

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.

persistent, blades reniform or orbiculate, undivided or sometimes innermost 3-parted or -foliate, 1.4-4.2 × 2-5.2 cm, base shallowly to deeply cordate, margins crenulate to crenate-lobulate, apex rounded to rounded-obtuse.

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.

pedicels glabrous or nearly so;

receptacle sparsely to very sparsely pilose;

sepals 2.5-4 × 1-2 mm, abaxially glabrous;

petals 5, 1.5-3.5 × 1-2 mm;

nectary scale glabrous.

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.

ovoid, 3-6 × 2.5-5 mm;

achenes 1.4-1.6 × 1-1.5 mm, glabrous;

beak subulate, curved, 0.1-0.2 mm.

= 16.