Flora of North America species comparison

not flexuous, with decurrent lines from leaf bases, usually puberulent, rarely glabrous; short shoots absent.

35–165 mm;

stipules linear, to 4.5 mm, puberulent;

petiole 7–28 mm, usually puberulent;

petiolar gland adnate to expanded petiole channel, narrowly elliptic, 1.2–3.5 mm;

rachis 25–145 mm;

pinnae 7–14(–19) pairs, 30–75 mm;

leaflets 25–55 pairs per pinna, blades linear, 2.8–7.2 × 0.7–1.4(–1.8) mm, base oblique and obtuse, apex acute, surfaces glabrous or puberulent.

densely flowered, globose heads, 12–18 mm diam., 1 in leaf axils or in terminal pseudoracemes or pseudopanicles, to 250 mm.

6–30 mm.

sessile;

calyx 1.2–2 mm, puberulent;

corolla white, 2–3 mm, puberulent;

filaments 6–8 mm.

70–160 × 15–30 mm, not constricted between seeds.

= 26.