Descripción: Plantas trepadoras o lianas con el tronco marrón. Ramitas cilíndricas y con savia lechosa al cortarlas. Hojas simples y opuestas, de 1-7 x 0.5-3 cm, oblongas o elípticas, con ápice agudo o acuminado, bordes enteros y base cordada. Las hojas presentan glándulas dispersas a lo largo de la nervadura principal. Inflorescencias axilares. Flores amarillas con la parte central roja o anaranjada. Corola hipocrateriforme. Frutos en folículos moniliformes y con constricciones entre las semillas, de 8-10 cm de largo. Semillas cubiertas de pelos de color marrón.

Especies Parecidas: A menudo se confunde con LK mandvi Mandevilla villosa LK2 , pero en M. villosa las hojas son ásperas al tacto.

Vine; stems sparsely pubescent. Leaves opposite; petioles 2-7 mm long, sparsely pubescent; blades elliptic to oblong-elliptic, acute to acuminate, narrowly cordate at base, 3-8 cm long, 1-3.5 cm wide, glabrous or pubescent especially along veins and margins, sparsely glandular along midrib. Racemes axillary, 3-6 (9) cm long; pedicels 3-5 mm long; bracts linear-lanceolate, 1-5 mm long, scarious; calyx lobes 5, narrowly triangular, 1-1.5 mm long, with a single squamella inside; corolla salverform, yellow with a red throat, the tube 2.5-3 cm long, curved and somewhat gibbous, the lobes 5, spreading, to ca 1.5 cm long; stamens included, attached near throat; anthers ca 1.5 mm long, connate, glued to stigma; nectaries 5, sometimes fewer and united, ca half as high as ovary; stigma 1, pentagonal-umbraculiform. Follicles paired, slender, 8-12 cm long, usually swollen at +/- equal intervals; seeds oblong, ca 5 mm long, densely pubescent with a tuft of brownish trichomes ca 1 cm long at apex, the seminiferous area held within swollen areas of follicle. Brown 191, White 132.