Flora of North America species comparison

to 0.5 m. Leaves homomorphic, pectinate;

petiole (0.4–)0.8–4(–6.5) mm;

sub-mersed leaves ovate in outline, 15–35 × 10–25 mm, segments 6–16, longest segment (7–)12–14(–18) mm; emersed leaves similar to submersed, transitional, elliptic to ovate in outline, (4–)10–20(–35) × (2–)5–15(–17) mm, segments (4–)8–18(–22), longest segment (1.4–)2–6(–8.5) mm.

bracteoles lanceolate to narrowly ovate, margins irregular, entire or broadly serrate to pinnatifid;

primary bracteoles 1–3.8 × 0.3–0.9 mm, secondary bracteoles 0.7–1.4 × 0.2–0.7 mm.

sepals green to purple, shallowly triangular, 0.6–1(–1.5) × 0.5–1.2 mm;

petals to 0.2 mm;

filaments to 1.7 mm;

anthers yellow, widely oblong, 0.4–1 × 0.2–0.6 mm;

pistil 1.6–2.8 mm;

style to 0.5 mm;

stigma pink to purple, lanceolate, to 1 mm, fimbriate.

obtusely 3-angled in cross-section, 2.2–3.2 × 2–3.8 mm, margins rounded to slightly winged, faces widely ovate to shallowly triangular, surface smooth to ± rugose or ± papillate to ± tuberculate;

sepals strongly accrescent, ascending with appressed margins.

= 14.