Flora of North America species comparison

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

cylindrical, 3–6 mm diam., (distinctly constricted at intervals, non-uniform diam., fleshy, slightly fragile, with dentate leaf scars).

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

erect, unbranched, 0.9–3(–4) dm.

absent.

3-foliolate, 7–20 cm, leaflets petiolulate or subsessile;

petiole 4–15 cm;

lateral leaflets subsessile or petiolulate, blade often similar to terminal, base often oblique;

terminal leaflet (petiolule 0.2–1(–1.7) cm), blade broadly ovate to oblong, 2–7.5 cm × 12–37 mm, base cuneate to obtuse, margins coarsely dentate to sharply incised, or deeply cleft into 2 or 3 lobes (lobes dentate or incised, margins puberulent).

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.

2 or 3, 3-foliolate, (rarely subopposite), petiolate, leaflets petiolulate or subsessile;

petiole (0.5–)1–4(–6.5) cm, base not auriculate;

lateral and terminal leaflets similar to rhizomal, distalmost sometimes much smaller.

ebracteate.

ebracteate.

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.

sepals (erect to ascending), oblong, 5–7 × 2–3 mm, lateral pair slightly saccate basally;

petals white or pink, oblanceolate, 10–17 × 3–6 mm, (not clawed, apex rounded);

filaments: median pairs 4–8 mm, lateral pair 3–6.5 mm;

anthers linear, 1.7–2.7 mm.

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

(flowering ones) horizontal to divaricate or deflexed, 7–20 mm.

linear, 1.5–3.5 cm × 1–1.5 mm;

ovules 14–28 per ovary;

style 0.2–1.5(–2.5) mm.

(undeveloped), linear-lanceolate, to 3 cm × 2 mm;

ovules 10–14 per ovary;

style 3.5–7 mm.

brown, oblong, 1–1.6 × 0.9–1.1 mm.

not known.

= 120, 124, 132, 138, 156, 161, ca. 208.