Flora of North America species comparison

glabrous.

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.

4.4–11 cm;

stipules persistent, 3.3–9.5 mm, with small, membranous margins at base, glabrous or pubescent;

petiole 3–14 mm;

pinnae 4–8 pairs;

nectary sessile, crateriform or flattened, between proximal pair of pinnae, rarely also between distal pairs of pinnae;

leaflets 32–72, blades 2.1–5.7 mm, venation obscure except for nearly centric midvein, surfaces glabrous.

1–2.3 cm, 1–3.5 cm in fruit.

0.8–2.7 cm, 1–3.3 cm in fruit.

stamens 10;

staminodia 7.5–17 mm, showy;

style exserted 3–5 mm beyond stamens.

stamens 10;

staminodia 0.5 mm;

style not 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.

reddish brown to nearly black, usually straight, sometimes recurved, linear, not constricted between seeds, dehiscent along both sutures, 5.5–8.5 cm × 3.2–5 mm, apex acute, apiculate with beak to 3 mm.

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, 5–12-flowered;

sterile flowers 0(1 or 2) per head; staminate and bisexual flowers 5–11 per head.