Rhabdadenia macrostoma (Benth.) Müll.Arg.

  • Authority

    Maguire, Bassett & Wurdack, John J. 1958. The botany of the Guayana Highland--Part III. Mem. New York Bot. Gard. 10: 1-156.

  • Family

    Apocynaceae

  • Scientific Name

    Rhabdadenia macrostoma (Benth.) Müll.Arg.

  • Description

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    Species Description - Herbaceous vine with white latex, flowers brilliant red.

  • Discussion

    The seeds of this species are now known. They are light brown, glabrous (microscopically puberulent), terete-linear and gradually tapering to a triangular beak, 2.3 cm long, 1.3 mm broad, the beak about 0.3 mm thick near the apex, the coma silky pale-tawny, about 3 cm long. The plant cited above is almost glabrous; the sepals are erect, up to 5-7 long. The material identified as R. pohlii Muell.-Arg. from north of the Amazon basin is hardly specifically different from our plant. The pilosity of the plants and even the length of the sepals, characters used to distinguish this species, are not reliable. For example, one of the two sheets at The New York Botanical Garden of Rusby & Squires 20 (lower Orinoco, Sacupana), cited as R. pohlii by Woodson, contains a specimen with a glabrous stem, the other a stem clearly pilose. The sepals are up to 10 mm in length. It is likely that the pilose material corresponds to R. macrostoma a pubescens Muell.-Arg. (Linnaea 30: 435. 1860), a name not accounted for in Woodson's monograph.

  • Distribution

    Wurdark & Monachino 41391, Apure, occasional in riverine tangle between Rio Orinoco and Piedra La Villa (opposite Eaudal Marimare), clev. 80-90 m, Jan 27, 1956.

    Venezuela South America|