Flora of North America species comparison

absent.

cylindrical, slender (rarely slightly thickened at stem base), 1–3(–4) mm diam.

erect, unbranched or, rarely, branched, 0.5–1.6(–3.5) dm.

erect or decumbent basally, unbranched or branched, (0.6–)1.5–6(–7) dm.

(7 or) 9–21-foliolate, (thick, veins impressed);

leaflets petiolulate or sessile;

lateral lobes or leaflets similar to terminal;

terminal lobe or leaflet blade orbicular, broadly ovate to lanceolate, base rounded to cuneate, margins usually entire.

absent.

2–4(–7), pinnatisect or pinnately compound, (7 or) 9–21-foliolate, (thick, veins impressed), petiolate, leaflets petiolulate or sessile;

petiole base not auriculate;

lobes or leaflets (of proximal leaves) (4–)7–10 each side of rachis, fewer distally, distal leaves with 4 or 5 lobes or leaflets each side of rachis;

terminal leaflet petiolulate or sessile, blade (or lobe) narrowly lanceolate to lanceolate, base cuneate, margins entire.

3–8(–11), 3 or 5-foliolate (rarely only terminal leaflet present), petiolate, leaflets petiolulate or subsessile;

petiole (0.7–)1–4(–6) cm, base not auriculate;

lateral leaflets (when present) subsessile or petiolulate (to 0.4 cm), blade similar to terminal, often much smaller and narrower than terminal;

terminal leaflet (petiolule 0.4–1.6 cm), blade usually ovate to orbicular, rarely subcordate, 1.5–4(–5) cm × 15–35(–50) mm, base truncate, rounded, or cordate, margins crenate, dentate, sinuate, or to 11-lobed.

ebracteate.

ebracteate.

sepals oblong or ovate, 3.6–4.4 mm, lateral pair saccate basally, (green with hyaline margins);

petals white-lilac, 9–12.3 × 4.8–6.8 mm, (clawed, apex rounded or emarginate);

filaments: median pairs 3.5–4.5 mm, lateral pair 2–3 mm;

anthers narrowly oblong, 0.9–1.4 mm.

sepals oblong, 2–3(–3.8) × 1–1.5 mm, lateral pair not saccate basally;

petals white, oblanceolate, 3.5–6(–7) × 1.5–2.5(–3) mm (not clawed, apex rounded or ± emarginate);

filaments: median pairs 2.5–3.5 mm, lateral pair 2–2.5 mm;

anthers oblong, 0.7–1 mm.

erect-ascending, 5–15 mm.

ascending to divaricate-ascending, (7–)10–20 mm.

linear, 1–1.8 cm × ca. 1.5 mm;

ovules ca. 16 per ovary;

style ca. 1 mm, (stout).

linear, 1.5–3.5 cm × 1–1.5 mm;

ovules 14–28 per ovary;

style 0.2–1.5(–2.5) mm.

brown, oblong, ca. 1.5 mm.

brown, oblong, 1–1.6 × 0.9–1.1 mm.

= 56, 60, 64, 80–100.