Flora of North America species comparison

usually branched or with spur branches 1 or several nodes preceding first peduncle, sometimes unbranched, robust, slender and almost solid, or stout and hollow, (35–)40–120(–160) cm.

usually erect, sometimes decumbent and ascending, green or purplish, fistulose when stout, 1–7+ cm underground, strigose.

(3.5–)5–25(–35) cm;

leaflets (9–)15–35, blades 6–45(–52) mm, apex obtuse, apiculate, or truncate-emarginate.

(3–)5–25(–35) cm;

stipules 3–18 mm, membranous early becoming scarious;

leaflets (7–)13–35, blades lanceolate, lanceolate-oblong, or elliptic, (5–)6–45(–52) mm, apex obtuse, apiculate, or truncate-emarginate, surfaces strigose, sometimes glabrous adaxially.

rarely loose, 3–16 × (2–)2.5–3 cm, flowers 11.3–16.3 mm.

20–100+-flowered, flowers spreading-declined;

axis 2.5–16 cm in fruit;

bracts 1.5–10 mm;

bracteoles 0–2.

slender or stout, (2.5–)4–12(–13) cm.

erect or incurved-ascending, (2.5–)4–22 cm.

1.2–2.5 mm.

1.2–3.5(–4) mm.

calyx (4.6–)5.5–9.6(–10.3) mm, lobes 1.5–5.5 mm;

corolla greenish white or dull stramineous.

11.3–17(–17.5) mm;

calyx short-cylindric, (4.6–)5.5–10.5(–11) mm, strigose or pilosulous, tube 4–8.5 mm, lobes subulate or triangular, 1.2–4.4(–5) mm;

corolla ochroleucous, greenish white, or stramineous;

keel (9.5–)10.2–13.6 mm.

terete or subterete, carinate by ventral suture, not grooved dorsally, (9–)10–15 × 4–5.2 mm, beak 2–6 mm, usually glabrous, rarely puberulent or strigulose.

brown then blackish, straight or incurved, cylindroid, terete, (9–)10–20 × 2.9–5.2 mm, somewhat fleshy becoming stiffly papery or leathery, usually strigose, strigulose, glabrate, or glabrous, rarely puberulent;

sessile or subsessile.

(18–)20–26(or 27).

(16–)18–26(–28).

3–18 mm, proximalmost usually ruptured becoming irregularly circumscissile.

= 16.