Flora of North America species comparison

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

monomorphic;

erect, unbranched, 30–80 cm, sparsely to densely patent- to ascending-pilose.

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 3-foliolate, rarely unifoliolate, 6–8 usually whorled medially on stem, often with 1 or 2 alternate leaves proximally, sometimes scattered and alternate;

stipules often persistent, subulate to narrowly ovate, 8–12 mm;

petiole 6–14.5 cm;

leaflets estipellate, surfaces densely pubescent abaxially, sparsely appressed-pubescent adaxially;

lateral blades oblique, smaller than terminal;

terminal blade broadly ovate, 5–13 × 5–14 cm, apex abruptly acuminate.

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.

terminal, unbranched or branched;

rachis densely uncinate-puberulent and villous;

primary bract subulate to narrowly ovate, 5–9 mm.

densely uncinate-puberulent or glabrous.

stout, 3–8 mm, uncinate-puberulent.

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.

calyx 3–3.5 mm, white-puberulent, hairs scattered, long, stiff;

corolla usually pink-purple, rarely white, 5–7 mm, keel connate along abaxial margin (enclosing reproductive organs).

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.

1–4-articulate;

segments asymmetrically depressed-obovate, 7.5–11 × 4–7 mm;

stipe 4–10 mm, glabrous or glabrate.

= 11.

= 22.