Flora of North America species comparison

ribbed, tomentulose or glabrous;

prickles along ribs, recurved.

stipules subulate, 2–6 mm, glabrous;

petiole 1.5–3 cm;

primary rachis 3.5–8.5 cm;

pinnae 4–6 pairs;

leaflets 4–6 pairs, blades obliquely elliptic to obovate, 5–14 × 2.5–6.5 mm, margins ciliate or eciliate, revolute, reticulate veins prominent abaxially and adaxially, apex mucronate, surfaces glabrous or puberulent.

40–70-flowered, axillary, globose capitula, solitary or in fascicles of 2–5, or aggregated in racemes, 11–15 mm diam.;

bracts spatulate, 1/3–1/2 corolla length.

0.8–1 cm.

0.2–0.5 mm.

bisexual;

calyx campanulate, lobes (4 or)5, 1/3 corolla length;

corolla white, tomentulose or glabrous, lobes (4 or)5, 1/3 corolla length;

stamens (5 or 8 or)10, filaments connate at bases, white;

ovary stipitate, tomentose;

style attenuate at apex;

stigma poriform.

stipitate, curved, oblong, 4.5–7.5 cm × 6–11 mm, reticulate-veined, constricted between seeds, valves with 6–8 segments, margin sparsely prickly or unarmed, apex apiculate to rostrate, faces glabrous;

stipe 10–15 mm.

6–8, dark brown, lenticular, 5 × 4.5–4.8 × 2–2.5 mm, testa porous, fissural line 90%.