Flora of North America species comparison

glabrous.

sparsely pubescent on 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.

4–8 cm;

stipules usually deciduous, rarely persistent, 1.2–6 mm, with small, membranous, erose auricles, glabrous or sparsely pubescent;

petiole 4–10 mm;

pinnae 3–6 pairs;

nectary sessile, crateriform or flattened, between proximal pair of pinnae, usually also between distal pair of pinnae, sometimes between all pairs;

leaflets 28–52, blades 4.2–7.4 mm, venation obscure except for eccentric midvein, surfaces glaucous, glabrous.

1–2.3 cm, 1–3.5 cm in fruit.

1.8–3 cm, 1.8–3.5 cm in fruit.

stamens 10;

staminodia 7.5–17 mm, showy;

style exserted 3–5 mm beyond stamens.

stamens 10;

staminodia 6–8 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.

dark warm brown, straight or curved distally away from axis, linear, not constricted between seeds, dehiscent along both sutures, 5.8–10.6 cm × 3.4–4.6 mm, apex acute or apiculate.

1 or 2 per axil, 23–43-flowered;

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

(or condensed spikes) 1 per axil, 9–20-flowered;

sterile flowers 3–7 per head; staminate and bisexual flowers 5–12 per head.