Flora of North America species comparison

ribbed to striate, hispid or glabrous;

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

terete, glabrous;

prickles irregular along internodes, recurved or straight;

brachyblasts present.

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.

some 1-pinnate, with 1 or 2 pairs of leaflets;

stipules subulate, 1.5–4 mm, glabrous;

petiole 0.2–0.6 cm;

primary rachis 0.2–0.5(–1.5) cm;

pinnae 1–3(or 4) pairs;

leaflets (1 or)2–7(or 8) pairs, blades obliquely oblong or elliptic to obovate, 2.5–6(–6.5) × 1–2.5 mm, margins eciliate, reticulate veins prominent abaxially, apex obtuse to acuminate, 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.

(5–)10–30-flowered, axillary, globose or semiglobose capitula, solitary, in fascicles of 2 or 3, or in pseudoracemes, 9–15 mm diam.;

bracts spatulate, 1/3 corolla length.

1–3 cm.

0.5–1.5(–2.5) cm.

0 mm.

0.5–1 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;

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

corolla purple, glabrous, lobes 4 or 5, 2/3 corolla length;

stamens 8 or 10, filaments connate at bases, pink or lilac;

ovary stipitate, glabrous;

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, curved, oblong, 15–45(–60) × 6–7.5(–10) mm, constricted between seeds, valves with (1 or)2–7(or 8) segments, bulliform, margin unarmed or randomly prickly, apex cuspidate to rostrate, faces glabrous;

stipe 5–9 mm.

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

(1 or)2–7(or 8), dark brown, lenticular, 4.5–5.5 × 3.9–4.8 × 2.5–3.5 mm, testa porous, fissural line 75%.