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.

thick, erect, clustered, many-branched, from woody rootstock;

branches ascending at 30–50º, 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 persistent, widely ovate to nearly lanceolate, 1.5–5.5 × 0.7–3 cm, base oblique to cuneate, apex acuminate;

petiole 2.2–3.5 cm;

leaflet blades elliptic to widely elliptic or ovate, 6.5–11 × 2.5–6.5 cm, lateral veins 9–12 pairs, not conspicuously net-veined abaxially, apex acute to acuminate, short-mucronate, surfaces tomentose.

6–25-flowered, 4–25 cm;

flowers in whorls of 2 or 3 or scattered.

20–40-flowered, 20–45 cm;

flowers in whorls of 2–5 or scattered.

2–8 cm;

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

7–10 cm;

bracts persistent, ovate, 8–14 × 3–8 mm.

3.5–5 mm, villosulous.

4–8 mm, densely tomentose.

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.

1.6–1.8 cm;

calyx 7–9 × 5–8 mm at limb, lobes 2–4 mm, equal to or shorter than tube;

wing and keel petals asymmetrically oblong-rhombic;

ovary densely tomentose;

ovules 10–13.

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

divergent, arcuate, 4.5–6.5 × 0.4–0.5 cm, densely tomentose.

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

5–10, brown, reniform, 3.5–4 × 2 mm, not beaked.