Flora of North America species comparison

reduced to thick crowns.

(when present) obsolete, single, few, or several to many.

1.5–14(–15) cm;

stipules (2.5–)4–11 mm, submembranous becoming scarious or papery;

leaflets 1–13(or 15), blades obovate to elliptic, oblanceolate, or orbiculate, 3–20 mm, apex acute to obtuse or retuse, surfaces villous-tomentulose.

odd-pinnate, usually petiolate, rarely short-petiolate or subsessile;

leaflets (1 or)3–39(–43).

2–8-flowered, flowers ascending;

axis 0.2–2.7 cm in fruit;

bracts 3.5–10 mm;

bracteoles 0–2.

subcapitate to loosely flowered, flowers erect, ascending, spreading, declined, or nodding, secund, and retrorsely imbricate.

0.5–11 cm.

1.4–5 mm.

14–32 mm;

calyx cylindric or campanulate, 7–20 mm, villous, tube 5–16 mm, lobes subulate to lanceolate, 1–4 mm;

corolla pink-purple;

banner recurved through 40°;

keel 12–26 mm.

purple, pink-purple, magenta-purple, violet, bluish, lilac, scarlet, ochroleucous, greenish white, or white, banner barely recurved (A. phoenix) or recurved through 20–50° (90–100° in A. accumbens), keel apex obtuse.

tubes cylindric or deeply campanulate.

ascending (humistrate), brown-stramineous, incurved, obliquely ovoid, obcompressed, (13–)18–28(–36) × 7–13(–17) mm, unilocular, fleshy becoming leathery, sparsely hirtellous to densely villous-tomentose, usually concealing surfaces.

usually deciduous, usually sessile, rarely subsessile or substipitate, gynophore sometimes present, usually ascending (humistrate), less often spreading or pendulous, subglobose to ellipsoid, narrowly lanceoloid, ovoid or oblong-ellipsoid, or lanceoloid-ovoid, straight or usually incurved, usually compressed dorsiventrally, sometimes obcompressed, 3-sided, turgid, or inflated, unilocular, subunilocular, or bilocular.

27–40(–46).

11–70.

basifixed or malpighian.

distinct (except anomalous forms of A. missouriensis, A. tephrodes, and A. zionis).