Flora of North America species comparison

thick, erect, solitary or few-clustered, several-branched, from woody rootstock;

branches ascending at 45º, moderately zigzag.

stipules persistent, widely ovate, 3–9 × 2–6 cm, base amplexicaul to cordate, apex acuminate;

petiole 2–5(–7) cm;

leaflet blades elliptic, 4–10 × 2–5 cm, lateral veins 6–8 pairs, not conspicuously net-veined abaxially, apex acute, surfaces villous.

30–90-flowered, 25–60 cm;

flowers in whorls of 3–5.

8–15 cm;

bracts persistent, ovate to lanceolate, 8–10 × 3–5 mm.

2.5–4 mm, villous.

1.7–2.2 cm;

calyx 7–9 × 7–8 mm at limb, lobes 3–4 mm, equal to or shorter than tube;

wing petals elliptic, keel petals obovate;

ovary velutinous;

ovules 7–9.

erect, straight, 3.5–5 × 0.5–0.7 cm, villous.

5–7, brown-black, widely elliptic, 4–5 × 2.5–3 mm, short-beaked.

= 18.