Flora of North America species comparison

± erect, loosely cespitose, branched.

basal and cauline, palmate;

stipules ovate, 1.1–1.5 cm, margins entire, apex acuminate-subulate;

petiole 5–15 cm;

petiolules absent;

leaflets 3, blades lanceolate to linear, 2–4 × 0.1–0.6 cm, base cuneate, veins prominent, margins remotely serrate, apex acute, surfaces glabrous.

terminal or axillary, 10–18-flowered, ellipsoid to subglobose, 1.8–2.2 × 2.3–2.5 cm, rachis prolonged beyond flowers, undivided or forked, often bearing sterile flower buds distally;

involucres absent.

7–16 cm, slightly twisted apically.

strongly reflexed in fruit, 0.5 mm;

bracteoles minute.

13–15 mm;

calyx tubular-campanulate, 6–8.5 mm, glabrous, veins 10, tube 2–2.5 mm, lobes unequal, triangular-subulate, orifice open;

corolla pink to purple, 15 mm, banner oblong, 14–16 × 6–7 mm, apex acute or apiculate.

ellipsoid, 5 mm.

1 or 2, brown, flattened ovoid, 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).