Flora of North America species comparison

strigillose, bark light gray, smooth, with inconspicuous scattered, brownish lenticels.

20–32 cm;

stipules 2 mm;

petiole 3–7.5 cm, glabrescent or puberulent;

gland proximal or sub-basal, elliptic, length to 1.5 times width;

pinnae (4 or)5–12 pairs, 5.5–10 cm, with gland between 1 or 2 distal pairs;

leaflets (13–)17–22(–36) pairs, blades not bicolored, oblong, 0.7–1.5 cm, venation palmate, midvein marginal or submarginal, base strongly asymmetric, truncate, apex acute, short-mucronate, surfaces glabrous or sparsely pubescent;

terminal pair not heteromorphic.

18–25-flowered, terminal or axillary, capitula;

axis densely strigillose.

3–9 cm, densely strigulose;

bracts linear-lanceolate, 2(–5) mm.

to 1 mm.

calyx campanulate, (2.5–)6 mm, lobes 5 or 6, glabrescent;

corolla campanulate, (8–)12 mm, lobes 4 or 5, strigillose distally;

stamens 32, white proximally, pink distally, 30–35 mm, tube (10–)12 mm;

terminal or central flower calyx 3 mm, lobes 5, glabrous;

corolla 9–12 mm, lobes 5;

stamens 28 mm, tube long-exerted, to 18 mm.

fuscous-ferruginous, 10–20 × 1.5–2.6 cm, margins straight or slightly constricted, base acute, apex rounded, narrowing to a beak to 1.5 cm, valves membranous, glabrescent, smooth or slightly rough.

6–8(–10), 9 × 5 mm.

= 26, 52.