Flora of North America species comparison

prostrate or decumbent, or erect in emergent plants, unbranched.

1–11(–20) dm.

cauline;

not rosulate;

petiolate;

petiole base sometimes auriculate, blade (pinnately compound in emerged plants, or simple in deeply submerged plants, lateral leaflets petiolulate or sessile, 1–6(–12) pairs), margins entire, repand, or, rarely, dentate.

petiole not winged, base auriculate;

blade 3–9(–13)-foliolate, (1–)2–15(–22) cm;

lateral leaflets sessile or petiolulate, rachis not winged, blade smaller than terminal;

terminal leaflet (or simple blade) suborbicular to ovate, or oblong to lanceolate, (0.4–)1–4(–5) cm × (3–)7–25(–40) mm, base obtuse, cuneate, or subcordate, margins entire or repand, apex obtuse.

(corymbose, several-flowered), elongated in fruit.

sepals erect or ascending, oblong [ovate], lateral pair subsaccate or not saccate basally, (glabrous);

petals usually white, rarely pink, obovate or narrowly spatulate, (longer than sepals), claw undifferentiated from blade, (attenuate to clawlike base, apex obtuse, acute, or rounded);

stamens tetradynamous;

filaments (white), not dilated basally;

anthers oblong, (apex obtuse);

nectar glands (2), lateral, annular or semiannular.

sepals 2–3.5 × 0.9–1.6 mm;

petals white or pink, spatulate or obovate, 2.8–4.5(–6) × 1.5–2.5 mm, (base to 1 mm), apex rounded;

filaments 2–3.5 mm;

anthers 0.6–1 mm.

divaricate or descending, slender, (glabrous or adaxially puberulent).

divaricate or descending, straight or recurved, 5–17(–24) mm.

siliques, sessile, usually linear, rarely narrowly oblong, smooth or slightly torulose, straight or slightly curved, terete;

valves each obscurely veined, glabrous;

replum rounded;

septum complete;

ovules 25–50 per ovary;

style obsolete or distinct;

stigma capitate.

(0.6–)1–1.8(–2.5) cm × (1.8–)2–2.5(–3) mm;

ovules (28–)36–60 per ovary;

style 0.5–1(–1.5) mm.

plump, not winged, oblong or ovoid;

seed coat (minutely to coarsely reticulate), not mucilaginous when wetted;

cotyledons accumbent.

biseriate, reddish brown, ovoid, (0.8–)0.9–1.1(–1.3) × (0.6–)0.7–0.9(–1) mm, coarsely reticulate with 25–50(–60) areolae on each side.

= 8.

= 32.