283. Ipomoea miquihuanensis J.A. McDonald, Brittonia 39: 110. 1987. (McDonald 1987b: 110)

Type.

MEXICO. Tamaulipas, 7 km SW of Miquihuana, Stanford, Retherford & Northcraft 705 (holotype GH00054520, isotype MO).

Description.

Slender twining herb, stems glabrous, reddish. Leaves petiolate, ovate-deltoid, base cordate to sagittate with narrow acute to obtuse auricles, apex finely acuminate and mucronate, both surfaces glabrous; petioles 0.5-3 cm. Inflorescence of solitary axillary flowers; peduncles 1.2-3 cm; bracteoles minute, aristate; pedicels 3-11 mm; sepals unequal, ovate-oblong, obtuse to rounded, sometimes mucronulate, glabrous, dotted with dark glands, margins narrow, scarious, outer 3-4 × 2 mm, inner 4.5-6 × 3 mm; corolla 4-6 cm long, funnel-shaped, reddish-purple with paler tube, glabrous, limb c. 4 cm diam., subentire. Capsules and seeds unknown.

Illustration.

McDonald (1987c: 85).

Distribution.

Apparently rare in pine forest at 2000-3200 m in NE Mexico.

MEXICO. Tamaulipas: type of Ipomoea miquihuanensis . San Luis de Potosí: M. Virlet d’Aoust 1852 (P). Nuevo León: J.C. Hinton 19261 (GBH, n.v.).

Note.

The dark glands on the sepals and the high altitude habitat confirm the affinity with Ipomoea dumetorum, but it is easily distinguished by its much larger corolla.