252. Ipomoea lambii Fernald, Bot. Gaz. 20: 535. 1895. (Fernald 1895: 535)

Type.

MEXICO. Nayarit, Tepic, F.H. Lamb 556 (holotype GH00054509, isotypes CAS, NY, US).

Description.

Perennial herb climbing to 4 m; stems thin, wiry, pubescent. Leaves petiolate, 6-17 × 4-15 cm, ovate, often shallowly 3-lobed, base cordate with rounded to acute auricles and a narrow sinus, apex acuminate, abaxially paler, thinly pubescent; petioles 1-8 cm. Inflorescence of compact 2-4-flowered pedunculate, axillary cymes; peduncles 1.7-15 cm; bracteoles 2-3.5 × 0. 5-1.2 cm, oblong-elliptic, boat-shaped, chartaceous; pedicels 5-15 mm, glabrous; sepals slightly unequal 15-20 × 10 mm, ovate, obtuse, mucronate, glabrous, the inner slightly shoerter and narrower; corolla 7-8 cm long, deep pink, funnel-shaped, thinly pubescent on midpetaline bands, limb c. 5 cm diam. Capsules and seed unknown.

Distribution.

A rare species of oak woodland in central Mexico between 1100 and 1300 m.

MEXICO. "Sierra Madre", 1100 m, Langlassé 909 (P). Guerrero: V.W. Steinmann & J.M. Porter 4942 (IEB). Michoacán: Cerro Cumbitinda, Mun. Tingambato, H. Díaz Barriga 5176 (IEB).

Note.

Very similar to Ipomoea invicta but more pubescent, the flower buds noticeably hairy.