Flora of North America species comparison

glabrous.

, pinnae, and rachises usually uniformly velutinus with spreading, white hairs, rarely sparsely pubescent 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.

2.1–6.8 cm;

stipules persistent, 1.7–4.5 mm, with erose, membranous wing curved under petiole, densely villous;

petiole 4–12 mm;

pinnae 3–7 pairs;

nectary sessile, crateriform, between proximal pair of pinnae, sometimes also between distal pairs of pinnae;

leaflets 24–44, blades 2.4–5.8 mm, venation obscure except for nearly centric midvein, surfaces glaucous, pubescent abaxially.

1–2.3 cm, 1–3.5 cm in fruit.

1.9–4 cm, 2.8–6.5 cm in fruit.

stamens 10;

staminodia 7.5–17 mm, showy;

style exserted 3–5 mm beyond stamens.

stamens 10;

staminodia 7.5–10.5 mm;

style slightly 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, sometimes irregularly constricted between seeds, dehiscent along both sutures, 4.2–8.2 cm × 2.1–3.5 mm, apex acute to attenuate with beak 1–6 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, 15–33-flowered;

sterile flowers 7–13 per head; staminate and bisexual flowers 11–20 per head.

= 28.