Flora of North America species comparison

glabrous.

sparsely pubescent along ridges or glabrous.

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.

2.7–3.6 cm;

stipules deciduous, 0.6–2.5 mm, with flared, membranous base, glabrous;

petiole 3–7 mm;

pinnae 3–7 pairs;

nectary usually present, rarely absent, sessile, crateriform, between proximal pair of pinnae, rarely additional glands borne between more distal pairs of pinnae;

leaflets 18–32, blades 2.5–4.8 mm, venation obscure except for eccentric midvein, surfaces glabrous.

1–2.3 cm, 1–3.5 cm in fruit.

0.5–1.8 cm, 0.7–2.5 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, usually showy;

style exserted 3–5 mm 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.

brown, straight, linear, often with 1–several irregular constrictions, dehiscent along both sutures, 5–9 cm × 2.9–4.8 mm, apex usually acute, rarely attenuate.

1 or 2 per axil, 23–43-flowered;

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

1 or 2 per axil, 21–37-flowered;

sterile flowers 3–10 per head; staminate and bisexual flowers 15–40 per head.