Flora of North America species comparison

erect or ascending, branched from root stock.

palmate;

stipules lanceolate, 0.8–3 cm, margins entire, apex acuminate;

petiole 0.8–15 cm;

petiolules 1 mm;

leaflets 3, blades ovate, elliptic, or lanceolate, 0.5–8 × 0.4–2.6 cm, basal blades thick, base cuneate, veins prominent, margins sharply serrate, those of basal leaves entire, sometimes shortly setose, apex acute, obtuse, or obcordate, surfaces glabrous.

terminal or axillary, 20–35-flowered, inverted or horizontal, depressed-globose or obovoid, 1.5–3.2 × 1.5–3 cm, rachis internodes not especially elongated;

involucres absent.

curved apically, 3–14 cm.

reflexed, 0.5 mm;

bracteoles broadly ovate, blunt, minute.

12–16 mm;

calyx campanulate, 5–6 mm, usually sparsely pubescent, sometimes glabrate, veins 5, tube 2–3.5 mm, lobes equal, 1–1.5 times tube, subulate, curved, orifice open;

corolla usually pink-purple, rarely white, 13–15 mm, banner lanceolate-ovate, 15–18 × 4–5 mm, apex rounded;

ovaries glabrous.

flattened, ellipsoid, 3–4 mm.

1–3, brown, flattened ovoid, 2–2.2 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.