Mandevilla polyantha K. Schum. ex Woodson, Ann. Missouri Bot. Gard. 19:73. 1932. TYPE: PERÚ. LORETO: Yurimaguas, Aug 1902 (fl,fr), E. Ule 6271 (HOLOTYPE: B [destroyed, photo F neg. 4530], LECTOTYPE, designated here: G barcode #00164714; ISOLECTOTYPES: HBG, MG barcode #006142). Distribution.— Ecuador and Perú, at 150–1400 m. Discussion.— Mandevilla polyantha belongs to the exothostemon group by its leaves with colleters along the midrib adaxially and gibbous corolla tube. It resembles M. trianae Woodson but can be separated by its long pedicels (11–133 mm long vs. less than 6 mm long). The gathering at G is designated as the lectotype of Mandevilla polyantha because it is the best-preserved isotype. Specimens examined: ECUADOR. Morona-Santiago: cerca de Santa Susana de Chiviaza, 1 Mar 1993 (fl), Harling & Stahl 26813 (CR, S); entre Santa Susana de Chiviazá y El Panecillo y Las OrquÍdeas, 3 Mar 1993 (fl), Harling & Stahl 26913 (CR, S); Cordillera de Cutucú, carretera Patuca–Morona, 5 Mar 1993 (fl), Harling & Stahl 26941 (CR, S); Cordillera de Cutucú, carretera Patuca– Morona, Piantza, 6 Mar 1993 (fl), Harling & Stahl 26972 (CR, QCA, S). Zamora-Chinchipe: valle del rÍo Waiwaime, cerca de la boca con el rÍo Quime,cercanÍas de compañÍa minera Ecuacorrientes, 20 Sep 2007 (fl), Croat & Ferry 98894 (CR, MO); Pachicutzha, 17 Oct 1991 (fl), Jaramillo 13948 (NY, QCA).

Published as part of Morales, J. Francisco, 2025, A New Species, New Records, And New Synonyms Of Mandevilla (Apocynaceae) From Ecuador, With Comments On Morphological Characters, pp. 39-50 in Journal of the Botanical Research Institute of Texas 19 (1) on pages 46-47, DOI: 10.17348/jbrit.v19.i1.1391, http://zenodo.org/record/16906690