Flora of North America species comparison

terete, strigose and puberulent;

prickles irregular along internodes, straight or recurved.

stipules widely lanceolate to ovate, lanceolate-ovate, or ligulate, 2–5 mm, usually densely strigose to pubescent or puberulent, rarely glabrescent;

petiole 0.2–2 cm;

primary rachis prickly and with acicular aculei between pinnae, 1–15(–17) cm;

pinnae 4–14 pairs;

leaflets 16–40 pairs, blades obliquely linear or linear-oblong, 3–9 × 0.5–2 mm, margins ciliate to setose, 3 or 4 parallel veins prominent abaxially, apex mucronulate or acute to apiculate, surfaces pubescent to strigulose or glabrous abaxially, glabrous adaxially.

80–100-flowered, axillary, globose or subglobose capitula, solitary and in fascicles of 2–4, or in racemiform branches, 10–18 mm diam.;

bracts linear-lanceolate or oblanceolate, 1/4–3/4 corolla length.

1.5–5 cm.

0 mm.

bisexual and staminate;

calyx irregularly laciniate or campanulate, lobes 4, 1/5–1/2 corolla length;

corolla pink, strigose or glabrous, lobes 4, 1/4–1/3 corolla length;

stamens 8, filaments connate at bases, lilac;

ovary sessile, hispid or pubescent;

style attenuate at apex;

stigma narrowly cupuliform.

sessile or stipitate, straight or curved, oblong, (30–)40–120 × 9–13 mm, not constricted between seeds, valves with (4–)7–25 segments, margin unarmed, apex apiculate or mucronate to cuspidate, faces setose or sparsely strigose and puberulent;

stipe 3–7 mm.

(4–)7–25, olive-ochre, oblong-elliptic, 5–6.5 × 2.3–3 × 0.8–1.5 mm, testa smooth, fissural line 90%.