Flora of North America species comparison

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

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

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

branches spreading at 45–80º, strongly zigzag.

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.

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.

7–30-flowered, 12–20(–30) cm;

flowers scattered.

terminal, 5–17-flowered, 7–20 cm;

flowers scattered.

4–9(–11) cm;

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

3–7 cm;

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

6–16 mm, glabrous or sparsely villous.

4–6 mm, villosulous.

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.

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.

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

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

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

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

= 36.

= 18.