173. Ipomoea aurantiaca L.O. Williams, Fieldiana Bot. 32: 187. 1970. (Williams 1970a: 187)

Type.

MEXICO. Chiapas, Mun. Tuxtla Gutiérrez, D.E. Breedlove & P. Raven 13362 (holotype F0054825, isotype DS).

Description.

Twining perennial, stems somewhat woody below, glabrous, often slightly winged. Leaves petiolate, 4-10 × 2-6 cm, ovate, finely acuminate, distinctly truncate to very broadly cuneate, glabrous, abaxially paler with prominent veins; petioles 1.5-2.5 cm. Inflorescence of 1-5-flowered axillary cymes; peduncles 2-7 cm, stout; bracteoles squamose, c. 1 mm; secondary peduncles sometimes present, 1-1.5 cm; pedicels 3-13 mm, thickened upwards; sepals unequal, glabrous, ovate to suborbicular, outer 4-6 mm, obtuse with narrow scarious margin, inner 7-12 mm rounded, mostly scarious; corolla 5-6 cm long, funnel-shaped, orange or yellow, glabrous, limb c. 3 cm diam., shallowly lobed with oblong-ovate lobes. Capsules 15 × 6-9 mm, conical, glabrous, rostrate; seeds 10-12 × 4 mm, black with long white marginal hairs to 10 mm.

Distribution.

Low altitude forest from southern Mexico south to Costa Rica.

COSTA RICA. Punta Arenas, W.A. Haber & E. Bello 5984 (MO, FTG).

NICARAGUA. Boaco, San Lorenzo, P. Moreno 18523 (FTG, MO).

GUATEMALA. Huehuetenango, J. Steyermark 51015 (F).

MEXICO. Chiapas: D.E. Breedlove 28080 (MICH); Barranca el Chorreadero, H. & C. Cabrera 5914 (ARIZ, MEXU); Chiapa de Corzo, El Chorreadero, D.E. Breedlove & Thorne 20461 (MO); Tuxtla Gutiérrez, D.E. Breedlove & P.H. Raven 1332 (MO).

Note.

Distinct because of its yellowish corolla and small truncate leaves.