Flora of North America species comparison

monomorphic; ascending or spreading, branched or unbranched, 20–60 cm, uncinate-puberulent and sparsely pilose.

ascending to erect or spreading, terete, usually pubescent, rarely glabrous.

3-foliolate, usually 4–6 and alternate;

stipules caducous, subulate to narrowly ovate, 1.5–5 mm, apex acute;

petiole 5.5–6.5 cm;

leaflets often estipellate, sometimes stipellate, surfaces appressed-pubescent;

lateral blade oblique, slightly smaller than terminal;

terminal blade broadly obovate to rhombic, 3–9 × 4–6.5 cm, apex acute or short-acuminate.

whorled or alternate, usually odd-pinnate, rarely unifoliolate;

stipules present, usually scarious, rarely thinly papery, striate, glabrate or hairy;

petiolate;

leaflets usually 3, rarely 1 [5 or 7], stipels present or absent, sometimes partly or wholly, filiform, usually reduced, scarious, blade margins entire, rarely undulate, ciliate, surfaces pubescent.

usually terminal, mostly unbranched, sometimes axillary from distal leaf axils and relatively short;

rachis white-pilose and densely uncinate-puberulent;

primary bract linear to narrowly ovate, 1–4 mm.

2–26-flowered, terminal, sometimes also axillary, sometimes a fertile shoot separately arising from basal part of vegetative stem, pseudoracemes, sometimes in panicles, lax-flowered, branched or unbranched;

bracts caducous, primary ones subtending flower cluster with secondary bracts each subtending 1 pedicel.

stout, 2–7 mm, uncinate-puberulent.

densely uncinate-puberulent or glabrous.

calyx 1.5–1.8 mm, white-puberulent, hairs rather abundant, long, stiff;

corolla white, 4.5–6.5 mm, keel distinct, not connate along abaxial margin (exposing reproductive organs).

papilionaceous;

calyx broadly campanulate, lobes 5, usually appearing 4-lobed, adaxial pair connate except apically, with 2 minute teeth, lobes shorter than tube;

corolla pink, pink-purple, or white [orange, red], banner clawed or tapering proximally, blade usually broadly obovate, often with pair of spots (false nectar guides) at base;

wing and keel petals clawed, keel usually connate along abaxial margin of blade (distinct in H. pauciflorum);

stamens 10, monadelphous;

anthers dorsifixed;

ovary stipitate.

loments, distinctly stipitate, stipe exserted from calyx, greater than 5 mm, glabrous or puberulent, compressed, very deeply incised abaxially, straight or shallowly undulate adaxially, 1–4-jointed, lateral faces densely uncinate-puberulent;

segments obliquely depressed or very shallowly obovate or obtriangular;

sutures glabrate, abaxial suture very deeply incised, adaxial distinctly thickened, connections between segments (isthmi) less than 1/5 as broad as pod.

2–5, flat, obliquely depressed-obovate, broadest 2/3 distance towards anterior end, without rim-aril around hilum;

cotyledons of seedlings hypogeous, remaining underground being enclosed in loment-segment, rarely epigeous.

1 or 2(or 3)-articulate;

segments asymmetrically obtriangular, 9–14 × 6–8 mm;

stipe 5–9 mm, uncinate-puberulent.

= 11.

= 22.