Flora of North America species comparison

(few to several from base), usually ascending, decumbent, or prostrate, rarely erect, branched distally, 1–4.2(–5) dm, (hirsute proximally).

erect, unbranched or often branched distally, 3–8.5(–11) dm.

not rosulate;

blade margins pinnatifid.

absent.

shortly petiolate or sessile;

blade oblong or oblanceolate to obovate, (terminal lobe oblong), (2–)3.5–10(–12) cm × (5–)10–30(–37) mm, (lateral lobe smaller than terminal), base usually auriculate, rarely amplexicaul, margins: proximal pinnatifid or sinuate, distal dentate or entire, (surfaces sparsely pubescent).

submerged shortly petiolate, emergent sessile or petiolate (to 2 mm);

blade: submerged pectinate, finely 1–4-pinnatisect into filiform or capillary segments, emergent lanceolate to oblong, usually undivided, rarely lobed, (1.5–)2–5.5(–6.7) cm × (5–)7–15(–20) mm, margins entire or dentate.

elongated.

elongated.

sepals erect, oblong, 0.8–1.8 × 0.5–1 mm;

petals (erect), yellow, oblanceolate to spatulate, 0.5–1.8 × 0.2–1 mm;

median filaments 0.9–1.3mm;

anthers ovate, 0.3–0.5 mm.

sepals (deciduous after anthesis), ascending, oblong, 2–4 × 1.4–1.8 mm;

petals white, spatulate to obovate, 4–8 × 2–3.5 mm;

median filaments 3–4 mm;

anthers linear, 1.7–2.2 mm.

divaricate-ascending to horizontal, straight or recurved, (1.2–)1.7–5(–8) mm.

divaricate to horizontal or slightly reflexed, straight or curved, (5–)7–15 mm.

silicles or siliques, curved, ovoid to pyriform, 2–8(–8.8) × (0.5–)1–2.5 mm;

valves glabrous;

ovules (20–)30–80 per ovary;

style 0.3–1 mm.

silicles, straight, oblong to ellipsoid, 4–7 × 2.5–3 mm; (septum reduced to a rim);

ovules 48–80 per ovary;

style 2–4 mm; (stigma slightly 2-lobed).

biseriate, brown, cordiform, 0.5–0.7 mm, colliculate.

biseriate, brown to reddish, ovoid, 0.7–0.8 mm (0.5–0.6 mm diam.), reticulate.

= 16.

= 24.