Flora of North America species comparison

erect, 30–150 cm, strigillose to strigose-hirsute.

erect, ascending, spreading, decumbent, or prostrate, glabrous or pubescent.

3-foliolate;

stipules absent;

leaflet blades linear to linear-lanceolate or lanceolate, 40–110(–150) mm, length 5–10 times width, surfaces sparsely strigose abaxially, glabrous adaxially.

alternate, palmately compound or unifoliolate;

stipules present or absent, usually persistent, filiform to foliaceous;

petiolate or subsessile;

leaflets 1 or 3[–7], stipels absent, blades 5–150 mm, margins entire, surfaces glabrous or pubescent.

12–26(–40)-flowered, terminal, subterminal, or lateral, 10–35 cm;

bracts persistent, subulate or filiform, 0.5–3 mm, basally expanded.

(1 or)2–50-flowered, usually terminal or subterminal, leaf-opposed, rarely axillary, racemes [heads or flowers solitary or fascicled];

bracts present, persistent or caducous;

bracteoles present, paired proximal to calyx.

calyx broadly cylindrical, truncate basally and deflexed against pedicel, 2.5–4 mm, lobes subulate to triangular-acuminate, usually shorter than tube, shiny-glabrous or glabrate;

corolla yellow with faint reddish purple lines, often dark purple basally, 8–11 mm.

papilionaceous;

calyx usually cylindrical, rarely campanulate or cupulate, lobes 5;

corolla usually yellow, sometimes orangish, rarely white, blue, or lavender, glabrous or hairy outside;

stamens 10, monadelphous;

anthers alternately basifixed on long filaments and dorsifixed on small filaments, dehiscing longitudinally;

style with 1 or 2 lines of hairs adaxially;

stigma terminal, usually bilobed.

legumes, subsessile to long-stipitate, usually inflated, globose, ovoid to ellipsoid, or cylindrical, dehiscent, often tardily so, glabrous or pubescent.

(16–)18–38 × 4–6 mm, tip upcurved, strigose.

1–70, oblique-cordiform to oblong-reniform;

hilar sinus obvious, aril sometimes conspicuous.

= 7, 8.

= 16.