Flora of North America species comparison

slender, erect or ascending, solitary or clustered, few-branched, from woody rootstock or rhizomes;

branches ascending at 25–50º, weakly zigzag.

stipules persistent, ovate to widely ovate or elliptic to widely elliptic, 1–2.6 × 0.5–1.5(–2.2) cm, base cuneate to oblique, apex acute to obtuse, short-mucronate;

petiole 0.8–2.2 cm;

leaflet blades elliptic to obovate or narrowly elliptic, 1.7–3.3 × 0.6–2 cm, lateral veins 5–7 pairs, conspicuously net-veined abaxially, apex acute to obtuse, sometimes short-mucronate, surfaces appressed-pubescent to sparsely tomentose or glabrate abaxially, glabrous adaxially.

5–15-flowered, 4–12 cm;

flowers in whorls of 2 or 3 or scattered.

1–4 cm;

bracts deciduous, elliptic to obovate, 5–9 × 3–5 mm.

3–7 mm, glabrate to densely appressed-pubescent.

1.9–2.1 cm;

calyx (6–)8–10(–12) × 4.5–6 mm at limb, lobes (3–)4–5 mm, equal to or shorter than tube;

wing petals asymmetrically oblong to very widely ovate, keel petals asymmetrically oblong-widely elliptic;

ovary glabrate to appressed-puberulent;

ovules 12–14.

divergent, strongly arcuate to annular, 3–7 × 0.4–0.7 cm, glabrate to sparsely tomentose.

2–10, brown, elliptic, 3.5–4 × 2.5 mm, beaked.

= 18.