Flora of North America species comparison

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

sometimes ligneous basally, mostly decumbent to prostrate, 15–100 cm, minutely and sparsely strigillose.

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.

3-foliolate;

stipules caducous, narrowly triangular, setaceous, 0.5–1 mm;

leaflet blades narrowly obovate to oblong or elliptic-oblong, 7–15(–35) mm, length 1.5–3.5(–6) times width, surfaces strigose abaxially, glabrous adaxially.

(1–)4–8-flowered, terminal, subterminal, or lateral, 1–6(–10) cm;

bracts caducous, subulate.

(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.

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.

calyx campanulate, 3–5.5 mm, lobes triangular, strigose;

corolla yellow, often red- or orange-tinged or red-lined, 7–11 mm.

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

yellowish, 12–20 × 4–8 mm, minutely strigillose.

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

hilar sinus obvious, aril sometimes conspicuous.

= 7, 8.

= 32.