Flora of North America species comparison

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

branches ascending at 45º, moderately zigzag.

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

branches spreading at 30–70º, moderately to strongly 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.

stipules persistent, asymmetrically ovate-elliptic, 2.5–3.5 × 1.5–3 cm, base cuneate to cordate, apex acuminate;

petiole 2.5–4(–5) cm;

leaflet blades elliptic to obovate or rhombic, 3–6(–8) × 2–3.2 cm, lateral veins 6–9 pairs, conspicuously net-veined abaxially, apex acute, obtuse, or emarginate, surfaces glabrous.

30–90-flowered, 25–60 cm;

flowers in whorls of 3–5.

7–30-flowered, 12–20(–30) cm;

flowers scattered.

8–15 cm;

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

4–9(–11) cm;

bracts semipersistent, ovate, 6–8 × 3–5 mm.

2.5–4 mm, villous.

6–16 mm, glabrous or sparsely 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.

2–2.3 cm;

calyx 8–10 × 7–8 mm at limb, lobes 2–3 mm, much shorter than tube;

wing petals elliptic, keel petals asymmetrically oblong-elliptic;

ovary sparsely villous;

ovules 9–14.

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

irregularly divergent, straight, 3–6 × 0.4–0.6 cm, inconspicuously pubescent.

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

2–8, tan, oblong, 3–4 × 2 mm, short-beaked.

= 18.

= 36.