Flora of North America species comparison

ribbed to striate, hispid or glabrous;

prickles infrastipular, paired, also sparse along internodes, recurved.

ribbed, glabrous;

prickles along ribs, recurved.

stipules lanceolate, 7–12 mm, glabrous to sparsely setose;

petiole 1–4.5 cm;

primary rachis 0–2.5 mm;

pinnae 1 or 2 pairs, digitate;

leaflets 15–25 pairs, blades obliquely linear-oblong, 5–10 × 2–2.5 mm, margins setose, 1 eccentric vein prominent abaxially, apex acute to mucronate, surfaces glabrous.

stipules subulate to narrowly lanceolate, 1.5–4 mm, glabrous;

petiole 2–4 cm;

primary rachis 0.7–2.5 cm;

pinnae 1–3 pairs;

leaflets 6–9 pairs, blades obliquely linear-oblong to oblong, 3–6 × 0.8–2 mm, margins ciliate, 1 eccentric vein evident abaxially, apex acute, mucronulate, surfaces glabrous.

95–125-flowered, axillary, globose or subglobose capitula, solitary or fascicles of 2 or 3, also disposed in racemiform branches, 10–15 mm diam.;

bracts linear to lanceolate, 1/2–2/3 corolla length.

20–70-flowered, axillary, globose capitula, solitary or fascicles of 2, 10–15(–18) mm diam.;

bracts linear-lanceolate, 1/7–1/3 corolla length.

1–3 cm.

1–3.5 cm.

0 mm.

0.2 mm.

bisexual;

calyx campanulate, lobes 4, 1/10 corolla length;

corolla pink, glabrous, lobes 4, 1/4 corolla length;

stamens 4, filaments distinct to base, lilac;

ovary sessile to shortly stipitate, glabrous;

style attenuate at apex;

stigma poriform.

bisexual and staminate;

calyx campanulate, lobes 5(or 6), 1/8–1/5 corolla length;

corolla purplish pink, glabrous, lobes 5(or 6), 1/2 corolla length;

stamens 10(or 12), filaments distinct to bases, pink;

ovary sessile, glabrous;

style attenuate at apex;

stigma tubular.

sessile, straight, linear-oblong, 10–15 × 3–4 mm, constricted between seeds, valves with 2–5 segments, margin armed, long-setose, apex acuminate, faces glabrous.

stipitate, straight, linear-oblong, tetragonal, 25–60 × 2.5–4 mm, not constricted between seeds, valves entire, 1.5–2.5 mm wide, margin 2–3 mm wide, prickly, apex rostrate, rostrum 2–6 mm, faces glabrous;

stipe 1–2 mm.

2–5, ochre, lenticular, 3–3.2 × 2.5–3 × 1–1.2 mm, testa smooth or porous, fissural line 90%.

6–9, brown, lenticular or rhomboid, 3.8–4 × 2.5–3 × 1.5–2 mm, testa porous, fissural line 90%.