Flora of North America species comparison

lenticellate, without conspicuous short shoots;

bark light gray, smooth.

ascending, twigs glabrous or puberulent, resting buds absent, short shoots absent.

9.5–13 cm;

stipules spinescent, straight, 8 mm;

petiole with flat proximal elliptic gland, 1–2 cm, glabrescent;

pinnae 2–4 cm, rachis with gland between 1 or 2 distalmost pair of pinnae, sometimes puberulent;

leaflet blades oblong, 5–6 × 2 mm, base oblique-rounded, apex acute with small mucro.

alternate, even-bipinnate, not sensitive to touch;

stipules present;

petiolate, petiole with extrafloral nectaries;

pinnae (3–)4–6 pairs, opposite, extrafloral nectary present between distalmost 1 or 2 pair(s);

leaflets (22–)30, opposite, blade margins entire, venation brochidodromous, surfaces glabrous or glabrate.

capitate, 2 or 3 per node, on short axis, strigulose, flower heads 2.5–4 cm diam.;

bract caducous, linear-lanceolate, 0.7 mm.

14-flowered, axillary, heads, sometimes forming pseudoracemes;

bracts present.

in groups of 2 or 3, 1.8 cm, strigulose.

sessile;

bracteole caducous, proximal, 1 mm;

calyx 1.2 mm, estrigulose toward apex;

corolla campanulate, 4.3 mm, 4- or 5-lobed, strigulose toward apex;

stamens white or brownish cream, 10 mm, tube 3 mm;

ovary 1 mm, glabrous.

mimosoid, actinomorphic, homomorphic;

calyx campanulate, lobes 5 or 6, calyx and corolla connate, valvate;

corolla greenish;

stamens 25–30[–50], monadelphous, connate into a tube;

anthers dorsifixed.

legumes, usually stipitate, laterally compressed, straight, broadly linear-oblong in outline, dehiscing along margin, glabrous;

not constricted between seeds, undulate above seeds.

6.5–9 × 1–1.5 cm, margins thin, base rounded, apex apiculate, beak to 7 mm, valves membranous, fuscous-ferruginous;

stipe to 1.2 cm.

7 × 5 mm.

(8–)10–15, flattened, oblong to circular in outline;

pleurogram present, aril absent.

= 13.