Flora of North America species comparison

glabrous.

pubescent through-out or pubescent only along ridges.

2–5 cm;

stipules persistent, 1.5–2.5 mm, with flared, membranous bases, glabrous;

petiole 5–15 mm;

pinnae 1–3(or 4) pairs;

nectary sessile or stipitate, crateriform, interpinnal between proximal pair of pinnae;

leaflets 16–34, blades 4–8 mm, venation obscure except for eccentric midvein, sometimes also 1 short, arcuate vein from base, surfaces glabrous.

1.6–4.1 cm;

stipules persistent, 1–4 mm, with an erose, membranous vein curled abaxially under pulvinus (sometimes absent), pubescent;

petiole 3–11 mm;

pinnae 1–3(or 4) pairs;

nectary usually present, rarely absent, sessile, crateriform, interpinnal between proximal pair of pinnae;

leaflets 12–30, blades 3–6 mm, venation conspicuous abaxially with raised reticulate midvein, usually also 2 other veins arising from base, raised crossveins also present, surfaces sparsely pubescent abaxially, glabrous adaxially.

1–2.3 cm, 1–3.5 cm in fruit.

1.3–6 cm, 1.9–6.2 cm in fruit.

stamens 10;

staminodia 7.5–17 mm, showy;

style exserted 3–5 mm beyond stamens.

stamens 10;

staminodia 5–10.5 mm;

style exserted beyond stamens.

brown, straight to slightly arcuate, linear, constricted between seeds, dehiscent along both sutures, 5.5–13 cm × 2.7–4 mm, apex acute, rarely with short beak to 3 mm.

dark brown, straight, linear, often with 1–several irregular constrictions, with slightly raised venation on valves, dehiscent along both sutures, 2.5–5 cm × 2.2–3.2 mm, apex obtuse or apiculate, rarely acute.

1 or 2 per axil, 23–43-flowered;

sterile flowers 5–16 per head; staminate and bisexual flowers 8–30 per head.

1 per axil, 6–14-flowered;

sterile flowers 3–7 per head; staminate and bisexual flowers 4–10 per head.