Flora of North America species comparison

erect or decumbent, sparsely branched.

palmate;

stipules lanceolate to narrowly ovate, 1.5–2 cm, margins toothed or lacerate, apex acuminate;

petiole 1–3.5 cm;

petiolules to 0.5 mm;

leaflet blades linear, elliptic, or obovate, 0.8–2.5 × 0.1–0.3 cm, base cuneate, veins thickened, margins entire or finely serrate to setose-spinulose, apex acute or apiculate, surfaces glabrous.

terminal or axillary, 8–20-flowered, subglobose to globose, 1.5–2 × 1.5–4 cm;

involucres broadly campanulate, 10–22 mm, incised to 3/4 their length, lobes 10+, triaristate to lacerate.

4–6 cm.

straight, 0.5 mm;

bracteoles subulate or broadly wavy-margined, 2–3 mm.

12–20 mm;

calyx tubular-conic, 5–7 mm, glabrous, veins 10, tube 2–2.5 mm, lobes ± equal, 6–8 mm, abaxial lobe longer than tube, orifice open;

corolla white, lavender, or purple, sometimes with different colors within inflorescence, 11–13 mm, banner narrowly oblong [broadly obovate-oblong], 11–13 × 4 mm, apex rounded.

oblong, 3–6 mm.

2–4, olive, reniform, 1.3–1.5 mm, smooth.

difficulty of distinguishing Trifolium mucronatum from T. wormskioldii is discussed under 33. T. wormskioldii.

in the United States represent T. mucronatum subsp. lacerum; in Mexico, subsp. lacerum is found in the north, subsp. mucronatum (petals pink or reddish, flowers 1.5–1.7 cm, inflorescences 2.5–3.5 cm diam.) is widespread, and subsp. vaughanae J.

.;

m .

(petals lavender or white, flowers 1.2–1.4 cm, inflorescences 1.5–2 cm diam.) is restricted to central Mexico (Guanajuato, San Luis Potosí) (J.; gillett 1980).

= 16.