Flora of North America species comparison

glabrous.

glabrous or sparsely pubescent with short, white hairs along ribs, glabrescent.

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.

2.3–7.5 cm;

stipules persistent, 1.4–2.5 mm, with membranous auricles opposite petiole, glabrous;

petiole 3–7 mm;

pinnae 1 or 2 pairs;

nectary sessile, crateriform, between proximal pair of pinnae;

leaflets 38–52, blades 2.7–6.5 mm, venation obscure except for eccentric midvein, surfaces glabrous.

1–2.3 cm, 1–3.5 cm in fruit.

0–0.5 cm, 0.4–0.9 cm in fruit.

stamens 10;

staminodia 7.5–17 mm, showy;

style exserted 3–5 mm beyond stamens.

stamens 10;

staminodia 1.5–2 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, ± falcate, linear, not constricted between seeds, dehiscent along both sutures, 3.5–5 cm × 3–3.5 mm, apex 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, 7–9-flowered;

sterile flowers 1 or 2 per head; staminate and bisexual flowers 5–8 per head.

= 28.