Flora of North America species comparison

ribbed to striate, hispid or glabrous;

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

terete, strigose to strigulose;

prickles sparse along internodes, 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 widely ovate, 2–4.5 mm, striate, glabrous;

petiole 1–7.5 cm;

primary rachis 1–8 cm;

pinnae 3–7 pairs;

leaflets (8–)10–15(–19) pairs, blades obliquely linear to oblong, 3–5.5(–8) × 0.5–1.5 mm, margins strigulose, parallel veins prominent abaxially, apex acute to mucronate, 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.

80–140-flowered, axillary, subglobose capitula, solitary, 12–30 mm diam.;

bracts spatulate, 1/2 corolla length.

1–3 cm.

(2–)3–34 cm.

0 mm.

0 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 4, 1/6 corolla length;

corolla purplish pink, strigose, lobes 4, 1/3 corolla length;

stamens 8, filaments connate in a tube 1/4–1/3 corolla length, pink;

ovary stipitate, strigose;

style attenuate at apex;

stigma poriform.

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, obliquely oblong, 10–28 × 6–9 mm, constricted between seeds, valves with 1–4 segments, margin unarmed, strigose, apex mucronate, faces strigose to strigulose;

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%.

1–4, brown, elliptic or lenticular, 3.5–6.5 × 2.8–4.2 × 1–1.5 mm, testa porous, fissural line 90–95%.