Ipomoea riparum Standl. & L. O. Williams

Wood, John R. I., Munoz-Rodriguez, Pablo, Williams, Bethany R. M. & Scotland, Robert W., 2020, A foundation monograph of Ipomoea (Convolvulaceae) in the New World, PhytoKeys 143, pp. 1-823 : 1

112. Ipomoea riparum Standl. & L. O. Williams , Ceiba 1: 63. 1950. (Standley and Williams 1950: 63)

Ipomoea diriadactylina Hammel, Phytoneuron 2012 -27: 1. 2012. (Hammel 2012: 1-6). Type. COSTA RICA. Santa Cruz, rumbo a Vista al Mar por P.N. Diriá, B. Hammel & I. Pérez 25480 (holotype MO6409984, isotypes apparently not distributed).

Type.

HONDURAS. Dept. Morazán, Río de la Orilla, A. Molina 2528 (holotype EAP, n.v., isotypes GH, F, US).

Description.

Perennial liana of unknown height, stems glabrous or with a few dispersed trichomes. Leaves petiolate, 8-20 × 5-15 cm, ovate, acuminate, cordate with rounded auricles, glabrous, abaxially paler, sometimes black-dotted; petioles 4.5-10 cm. Inflorescence of shortly pedunculate, dense, bracteolate axillary cymes; peduncles 0.6-1.5 cm; bracteoles 10-20 × 5-10 mm, elliptic, mucronate, obscurely pustulate, persistent; pedicels 1-5 mm; sepals subequal, somewhat similar in texture to bracteoles, 11-16 × 5-10 mm, oblong-elliptic, obtuse and mucronate, abaxially pustulate, margins paler; corolla 5-7 cm long, funnel-shaped, glabrous, tube greenish, limb 5-6 cm diam., white, undulate; stamens included. Capsules 11-12 × 10 mm, subglobose, shortly rostrate with the basal part of the style persistent, glabrous; seeds 6-7 × 4 mm, with long marginal hairs.

Illustration.

Hammel (2012: 2).

Distribution.

A rare species of low altitude forest in Central America.

COSTA RICA. Type of I. diriadactylina .

HONDURAS. Morozán, Tegucigalpa-Puente Colorado, A. & R. Molina 25845 (BM, F, S); ibid., zona de El Zamorano, P.C. Standley 26382 (BM).

Note.

Distinctive because of the dense, shortly pedunculate bracteolate cymes and white flowers.