Flora of North America species comparison

usually densely villous, rarely sparsely so, hairs often viscid when fresh, or glabrate on submerged stems.

glabrous.

alternate, sometimes fascicled;

stipules often asymmetrical;

petioles of basal leaves (0.5–)0.8–1.6 cm, those of distal leaves 0.5–2.8 cm;

blade (0.4–)1–6(–9.5) cm, apex glandular-mucronate, surfaces not shiny, usually densely hirtellous, rarely glabrous abaxially.

alternate, usually not fascicled;

stipules symmetrical;

petioles of basal leaves 0.7–2.5 cm, those of distal leaves 0.7–6 cm;

blade (2–)4–10 cm, apex eglandular-mucronate, surfaces shiny, glabrous.

anthers on short filaments (0.7–)0.9–1.8 mm, those on long filaments (0.8–)1.1–2.2 mm;

ovary 6–10 mm, apex truncate, densely hirtellous, sometimes only on apical 1/2, stigma usually as long as anthers, rarely exserted beyond them.

anthers subequal, 1.2–1.4 mm;

ovary 14–20 mm, apex somewhat broader, glabrous or with scattered hairs, stigma usually exserted beyond anthers, rarely as long as anthers.

(20–)24–32 × 2–4 mm, pedicel 7–38(–60) mm.

25–40 × 3–4 mm, pedicel 35–90 mm.

10–15 per locule.

16–18 per locule.

= 16 (32).

= 16.