Flora of North America species comparison

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

branches ascending at 20–45º, weakly or moderately zigzag.

slender, erect, clustered, many-branched, from single, woody rootstock;

branches spreading at 45–80º, strongly zigzag.

stipules persistent, widely ovate or elliptic, 1.7–4.5 × 0.7–2.5 cm, base oblique to cuneate, apex acuminate or acute;

petiole 1–4 cm;

leaflet blades elliptic or obovate, 3.5–8 × 0.7–3(–5) cm, lateral veins 6–11 pairs, conspicuously net-veined abaxially or not, apex acute or obtuse, sometimes short-mucronate or emarginate, surfaces sparsely appressed-pubescent or glabrous.

stipules sometimes persistent, lanceolate to narrowly ovate, 1–3.5 × 0.3–0.8 cm, base cuneate, apex acuminate;

petiole 1.6–3 cm;

leaflet blades elliptic, 4.5–8 × 2–3.5 cm, lateral veins 9–12 pairs, conspicuously net-veined abaxially, apex acute to acuminate, surfaces glabrous or sparsely puberulent.

6–25-flowered, 4–25 cm;

flowers in whorls of 2 or 3 or scattered.

terminal or lateral, scattered, 12–25 cm;

flowers 7–25-flowered.

2–8 cm;

bracts semipersistent, narrowly elliptic or elliptic to widely ovate, 6–10 × 2.5–6 mm.

2.5–5.5 cm;

bracts persistent, lanceolate, 8–12 × 1–3 mm.

3.5–5 mm, villosulous.

7–17 mm, glabrate.

1.6–2.2 cm;

calyx 9–11 × 5–8 mm at limb, lobes 3–5 mm, shorter than tube;

wings and keel petals asymmetrically oblong-elliptic;

ovary velutinous or densely appressed-pubescent;

ovules 10–16.

1.6–1.9 cm;

calyx 7–9 × 4–5 mm at limb, lobes 2–3 mm, much shorter than tube;

wing petals elliptic to asymmetrically oblong-elliptic, keel petals asymmetrically oblong-elliptic;

ovary appressed-pubescent;

ovules (6–)12–16.

ascending, straight, 4.5–6.5 × 0.4–0.6 cm, villosulous or appressed-pubescent.

irregularly divergent, straight, (3–)5.5–7.5 × 0.3–0.5 cm, inconspicuously appressed-pubescent.

6–16, brown-black, oblong, 3.5–5 × 2.5–3 mm, beaked.

(5–)10–15, brown, reniform, 4 × 2.5 mm, short-beaked.

= 18.