Flora of North America species comparison

1–2.5 dm, eglandular and usually glabrous or sparsely strigulose when young, rarely canescent.

erect, usually pubescent, rarely glabrate or glabrous, glandular nearly throughout, gland-dotted when young.

divaricate;

sterile shoots on shorter lateral branches sharp-tipped.

unifoliolate or pinnate, (0.7–)1–3 cm;

leaflets 1 (or 3), blades linear, 6–30 mm, terminal leaflet longer than laterals, surfaces usually glabrous with glandular margins abaxially, densely silvery-pubescent adaxially.

alternate, odd-pinnate or unifoliolate;

stipules present, caducous, usually triangular to subulate or linear, rarely obovate; petiolate;

leaflets 1–17(or 19), stipels absent, blade margins entire or gland-crenulate, surfaces usually glandular-punctate abaxially, pubescent.

loose;

rachis without thornlike tip in anthesis, 1–9 cm;

bracts triangular-subulate, 0.5–1.3 mm;

bracteoles present.

1–20+-flowered, terminal and axillary (sometimes leaf-opposed), usually racemes, rarely spikes;

bracts present, caducous;

bracteoles 0 or 2, at apex of pedicel or base of calyx.

calyx (4–)4.6–5.7(–6.5) mm, glabrous or strigulose externally, tube (2.8–)3.3–4.3(–4.6) mm, ribs prominent, narrow abaxial intervals each with 1–5 glands in 1 row, broader adaxial intervals each with 1–17 glands in 2 rows, lobes ovate-deltate to triangular, abaxial lobe slightly shorter and narrower;

corolla deep blue, banner with yellow eye;

banner flabellate, (6.4–)7.1–10.5 mm, tapered to cuneate claw, apex retuse;

wings broadly oblong, (6–)7–8.6 × 3–4.2 mm;

keel broadly oblong, (6.1–)6.5–8(–8.8) × 3.7–4.7 mm;

stamens 7–11 mm;

filaments distinct to 3.5–6.5 mm;

anthers 0.9–1.3 mm, connective not gland-tipped.

papilionaceous;

calyx campanulate, lobes 5, unequal;

ribs 10, not anastomosing into closed arches distally;

corolla usually blue, blue-purple, pink-purple, magenta-purple, violet-purple, violet, or bicolored, sometimes with yellow eye, rarely white;

banner blade differentiated from claw, reflexed less than 90°, claw shorter;

wings not adnate to keel, blades oblique basally, claws shorter, linear;

keel not strongly twisted, blades narrowly overlapping and adherent, oblique basally, blunt-tipped, claws linear;

stamens 10, monadelphous, equal or alternately short and long;

anthers dorsifixed;

style glabrous or pilosulous.

legumes, sessile, mostly tan, plump to compressed, obovoid, ovoid-ellipsoid, obovoid-ellipsoid, or obliquely obovoid or ellipsoid, indehiscent, often membranous proximally, thickened distally, gland-dotted, glabrous or pubescent.

obovoid, 7–10 mm, with large, separate glands, puberulent distally.

6–8 mm.

usually 1, rarely 2, chestnut to brownish or greenish, sometimes with brown or purple spots, somewhat compressed, oblong.

= 10.

= 20.