Flora of North America species comparison

pilosulous to glabrescent, bark light tan, fissured in rectangular plate, with conspicuous pale lenticels on young branches.

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.

6–24 cm;

stipules 2–4 mm;

petiole 6–7(–9.5) cm, ribbed to channeled, sometimes pilose;

gland proximal, ± circular;

pinnae 2 or 3 pairs, 7–14 cm, with gland between distal pair;

leaflets 5–7 pairs, blades not bicolored, oblong to ovate, 2–4(–5) cm, venation palmate-pinnate, midvein subcentral, base acute, apex rounded, mucronate, surfaces usually glabrous, sometimes translucent, pilose abaxially;

terminal pair not heteromorphic.

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

axis densely strigillose.

30–40-flowered, (1 or)2 or 3 per node, axillary, capitula;

axis pilose;

floral bracts linear, 2 mm.

3–9 cm, densely strigulose;

bracts linear-lanceolate, 2(–5) mm.

7–8 cm, pilose;

bracts linear, 3 mm.

to 1 mm.

, except central flowers, 1.5–4.5 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.

calyx tubular, 3–6 mm, lobes 5 or 6, short-pubescent;

corolla campanulate, 4–10 mm, lobes 4 or 5, glabrous except for lobes;

stamens 30, white, 15–25 mm, tube to 4 mm;

central flowers: sessile, calyx to 5.5 mm, lobes 5, pilose;

corolla 10–11 mm, campanulate, lobes 5;

stamens 20–30, to 23 mm, tube to 10 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.

sessile, ochre-brown, 1.2–18.6(–25) × 3.7–6 cm (including beak), margins straight to slightly constricted between seeds, base rounded, apex acute, with 10 mm beak, glabrescent, usually dehiscent along 1 suture, valves undulating, raised over seeds.

6–8(–10), 9 × 5 mm.

4–11, 7–8(–12) × 7–9 mm.

= 26, 52.

= 26.