Flora of North America species comparison

pale green, twigs moderately pubescent.

yellowish green, twigs glabrous or sparsely pubescent (at least around nodes).

stipules not spinescent;

petiole 1.6–3.5 mm, pubescent;

pinnae 2;

petiolules 0.2 mm, densely pubescent;

rachillas 3–7 mm, not winged, with glandular patches on adaxial side, not surrounding leaflet pulvini;

leaflets (4 or)6(or 8), opposite, blades elliptic to obovate, 3–7 × 1.6–3 mm, base cuneate to rounded, apex truncate to rounded, not apiculate, surfaces sparsely pubescent abaxially, sparsely pubescent to glabrate adaxially.

appearing pinnate;

stipules obsolescent or spinescent, spines to 20 mm;

petiole obsolete;

pinnae 2(or 3);

petiolules 0.2–0.3 mm, sparsely pubescent;

rachillas (100–)150–600 mm, narrowly winged, with sparse, glandular patches in leaflet axils;

leaflets 40–76, alternate, subopposite, or opposite, blades oblanceolate to oblong, 2–8 × 0.9–3 mm, base attenuate, apex obtuse, apiculate, surfaces sparsely pubescent abaxially, glabrate adaxially.

2–10-flowered, axis 1.1–3.5 cm, strigulose to glabrate;

bracts lanceolate, 0.3–0.4 × 0.2–0.3 mm;

bracteoles caducous.

2–15-flowered, axis 8–18 cm, strigulose to glabrate;

bracts linear or lanceolate, 2 × 0.3 mm;

bracteoles caducous or subpersistent.

10–14 mm, sparsely pubescent or glabrate, joints 1–3 mm from flower, bearded, rarely glabrous, usually nearer flower than pedicel base, rarely nearer pedicel base than flower.

5.4–13.8 mm, glabrous or sparsely pubescent, joints 1.5–3.5 mm from flower, not bearded, nearer flower than pedicel base.

calyx lobes sparsely pubescent abaxially, glabrous adaxially;

corolla 8–16 mm diam., petals deep yellow, adaxial one sometimes orange-dotted basally;

ovary glabrate.

calyx lobes usually deciduous, sparsely pubescent abaxially, pubescent adaxially;

corolla 13–20 mm diam., petals light to deep yellow, adaxial one usually orange-dotted basally;

ovary sericeous.

compressed, not constricted between seeds, 3.8–12 × 1–1.3 cm, glabrescent.

subterete, constricted between seeds, 2–12 × 0.5–0.8 cm, glabrous.

1 or 2(–4).

(1 or)2–5.

= 28.

= 28.