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, ascending or spreading, solitary or clustered, several-branched, from extensive rhizomes;

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 caducous, narrowly elliptic to linear, 1.5–2 × 0.3–0.5(–0.8) cm, base cuneate, apex acuminate;

petiole 0.7–1.7 cm;

leaflet blades elliptic, 3.5–8 × 1–4 cm, lateral veins 7–9 pairs, conspicuously net-veined abaxially, apex acute to acuminate, surfaces sparsely appressed-pubescent (especially on veins), sometimes glabrate adaxially.

6–25-flowered, 4–25 cm;

flowers in whorls of 2 or 3 or scattered.

terminal, 5–17-flowered, 7–20 cm;

flowers scattered.

2–8 cm;

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

3–7 cm;

bracts persistent, lanceolate, 8–13 × 2–4 mm.

3.5–5 mm, villosulous.

4–6 mm, villosulous.

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 7.5–8 × 6–7 mm at limb, lobes 2–3 mm, shorter than tube;

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

ovary densely appressed-pubescent;

ovules (8–)12–16.

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

divaricate, arcuate to straight, (3–)4–9 × 0.4–0.6 cm, densely appressed-pubescent.

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

6–12, tan to brown-black, oblong, 2.5–3.5 × 1.5–2 mm, beaked.

= 18.