Flora of North America species comparison

usually erect or ascending, sometimes decumbent, rarely prostrate, usually sparsely strigulose, sometimes pilosulous.

erect to ascending, strigulose.

2–9 cm;

stipules connate-sheathing and papery at proximal nodes, connate or distinct and herbaceous or submembranous at distal nodes, usually black or blackish when dry, 1.5–7 mm;

leaflets 11–21, blades narrowly oblong to elliptic, linear, oblanceolate, or obovate, 3–24 mm, apex acute to obtuse, mucronate, or emarginate, surfaces sparsely strigose abaxially, glabrous adaxially.

4–15(–18) cm;

stipules 2–4(–6) mm, papery-scarious at proximal nodes, subherbaceous at distal nodes;

leaflets 11–19(or 21), blades linear-oblong, narrowly oblong-oblanceolate, or obovate, 2–13 mm, apex obtuse, subtruncate, or shallowly retuse, surfaces strigose, sometimes glabrous adaxially.

(1–)3–23-flowered, often paired in leaf axils, flowers ascending;

axis 0.5–11 cm in fruit;

bracts 0.5–2.7 mm;

bracteoles 0–2.

(5–)8–15-flowered, flowers ascending;

axis (3–)5–18(–20) cm in fruit;

bracts 1.5–2.3 mm;

bracteoles 0.

narrowly ascending or incurved, 0.2–4 cm.

erect, 6–21(–24) cm.

0.7–3.2 mm.

1–2.8 mm, little or no clavate thickening in fruit.

6–9(–11) mm;

calyx 2.6–5.2 mm, strigose, tube 2–2.7 mm, lobes subulate, 0.7–2.5 mm;

corolla usually white to ochroleucous, sometimes pink-purple;

banner recurved through 40°;

keel 4.3–5.7(–6.5) mm.

10.5–13.8 mm;

calyx campanulate, 4.8–6.3 mm, strigulose-pilosulous, tube 3.1–4.2 mm, lobes subulate, 1.2–2.1 mm;

corolla ochroleucous, keel tip tinged lilac;

banner recurved through 40°;

keel 8.5–9.6 mm.

pendulous, green, often brown- or red-mottled, becoming brown or black, straight or curved, ellipsoid to oblong, laterally flattened, 7–16 × 2.5–4.5 mm, papery, usually glabrous, sometimes strigose;

stipe 0.6–6 mm.

erect, pale green or purplish becoming stramineous, straight, linear-oblong, 3-sided compressed, lateral face flat, dorsal face narrower and grooved, 15–30 × 2.7–4 mm, ± bilocular, thin becoming papery, glabrous;

septum 1–2 mm wide;

stipe 3.5–7 mm.

3–9.

16–18.

= 16, 24.