A new species of Philibertia (Apocynaceae) from Bolivia Author Keller, Héctor A. Instituto de Botánica del Nordeste, CC 209, 3400 Corrientes, Argentina; Facultad de Ciencias Forestales, Universidad Nacional de Misiones, Misiones, Argentina ibone@agr.unne.edu.ar Author Goyder, David J. Royal Botanic Gardens, Kew, Richmond, Surrey, TW 9 3 AE, UK text Darwiniana, nueva serie 2021 2021-08-23 9 2 293 298 http://dx.doi.org/10.14522/darwiniana.2021.92.963 journal article 10.14522/darwiniana.2021.92.963 7fb8ce2c-9c4d-42c3-837a-9f04e5ecab12 1850-1699 5838812 The four known species of Philibertia that lack a corona, with a stylar head that rises above the anthers, and with flowers over 1.5 cm long can be differentiated using the following key. 1. Corolla tube internally pubescent .............................................................................................................................. 2 1. Corolla tube internally glabrous ................................................................................................................................. 3 2(1). Corolla lobes held more or less erect; flowers nodding ....................................................................... P. longistyla 2. Corolla lobes spreading; flowers not nodding ............................................................................................. P. latiflora 3(1). Corolla tube 25-30 mm long; stylar head appendage included within the corolla tube; corpusculum at least 2.5 mm long ................................................................................................................................................................. P. speciosa 3. Corolla tube less than 15 mm long; stylar head appendage generally exserted from the mouth of the corolla; corpusculum 1.4-2 mm long .............................................................................................................................. P. woodii