Flora of North America species comparison

cylindrical, slender, 1–3 mm diam.

absent.

erect, unbranched or rarely branched distally, (0.8–)1–2.5(–3.5) dm.

(simple or several from base), erect or decumbent, (flexuous or straight, narrowly winged-angled), unbranched or branched distally, (1.4–)2–4.5(–5.3) dm.

(soon withered), not rosulate.

simple or 3-foliolate, (1.5–)3–8 cm, leaflets petiolulate or subsessile;

petiole (1–)2–6 cm;

lateral leaflets subsessile, blade similar to terminal, much smaller;

terminal leaflet petiolulate (to 1 cm), blade reniform to cordate, (0.5–)1–2 cm, base cordate, margins entire or 3-lobed.

3–7, 3-foliolate (or distalmost simple), petiolate, leaflets petiolulate or sessile;

petiole 0.7–3.5 cm, base auriculate (auricle 0.7–5 mm);

lateral leaflets sessile or petiolulate (to 0.5 cm), blade oblong to ovate or oblong;

terminal leaflet (petiolule 0.5–1 cm), blade broadly ovate to suborbicular or reniform, 1.5–4 cm × 15–35 mm, margins often 3 or 5-lobed (lobe apex minutely apiculate, glabrous on margin).

3–9, middle ones 5–9-foliolate, petiolate, leaflets petiolulate or subsessile;

petiole 1–3 cm, base not auriculate;

lateral leaflets similar to terminal, blade often smaller, with oblique base, distal leaflets subsessile, blade smaller and narrower distally;

terminal leaflet (petiolule 0.2–0.8 cm), blade usually broadly ovate to narrowly lanceolate, rarely oblong, 0.7–2 cm × 2–10 mm, base cuneate to rounded, margins repand, crenate, or 3-lobed.

ebracteate.

ebracteate, (rachis slightly to strongly flexuous or geniculate).

sepals oblong, 2.5–3 × 1–1.5 mm, lateral pair not saccate basally;

petals white, oblanceolate, 6–8 × 2–3 mm (not clawed, apex obtuse to subemarginate);

filaments: median pairs 3.5–4 mm, lateral pair 2–2.5 mm;

anthers ovate, ca. 0.7 mm.

sepals oblong, 2–3.5 × 0.7–1.2 mm, lateral pair not saccate basally;

petals white, linear, 6–8 × 0.7–1 mm;

filaments: median pairs 4–5 mm, lateral pair 3.5–4 mm;

anthers oblong, 0.7–1 mm.

divaricate-ascending, (7–)10–17 mm.

horizontal to divaricate or ascending, (3–)4–9(–12) mm.

linear, (1.5–)2–3.5(–4) cm × 1.3–1.7 mm;

ovules 10–16 per ovary;

style 2–4 mm.

linear, (2.5–)3–4.6 cm × 1.7–2.1 mm;

ovules 14–22 per ovary;

style 1–3 mm.

brown, oblong, 1.7–2 × 1–1.2 mm.

dark brown, oblong, 2–2.5 × 0.9–1.2 mm.