Flora of North America species comparison

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

branches spreading at 45–80º, strongly zigzag.

slender, erect, clustered, several-branched, from thick woody rootstock or rhizomes;

branches ascending at 20–35º, weakly to moderately or strongly zigzag.

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.

stipules persistent, ovate to narrowly elliptic, 2–3.5(–4) × 0.7–3 cm, base cuneate to cordate, apex acute;

petiole 1–2.5 cm;

leaflet blades elliptic to narrowly elliptic or rhombic, 3–7 × 0.5–2.5 cm, lateral veins 7–10 pairs, conspicuously net-veined abaxially, apex acute to obtuse, surfaces glabrate to puberulent.

terminal, 5–17-flowered, 7–20 cm;

flowers scattered.

5–15-flowered, 7–15 cm;

flowers usually in whorls of 2–4.

3–7 cm;

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

3–5 cm;

bracts deciduous, ovate to lanceolate, 7–14 × 3–5 mm.

4–6 mm, villosulous.

5–8 mm, glabrate to puberulent.

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.

2.5–2.9 cm;

calyx 8–11 × 6–8 mm at limb, lobes 2–5 mm, equal to or shorter than tube;

wing and keel petals elliptic to asymmetrically oblong-elliptic;

ovary appressed-pubescent;

ovules 10–18.

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

divergent, straight to arcuate, to ca. 45º, 6.5–9 × 0.6–0.8 cm, inconspicuously appressed-pubescent.

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

(6–)10–14, brown-black, elliptic, 4–5 × 2–2.5 mm, beaked.

= 18.

= 36.