Monographs Details: Couma rigida 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:Couma rigida Müll.Arg.
Description:Distribution and Ecology - VENEZUELA: Maguire & Politi 28098, Cerro Sipapo (Paraque), Territorio Amazonas, forest along lower Caño Negro, summit of Cerro Sipapo, 1400 m alt., Jan 1, 1949, small tree. Tate 732, summit of Mount Duida, dry slope of Savanna Hills, alt. 4400 ft, Aug 1928-April 1929, small tree, flowers red, juice milky. J. A. Steyermark 58243, summit of Serro Duida, Savanna Hills, alt. 1025-1200 m, Sept 2, 1944 (MO.). BRITISH GUIANA: Maguire & Fanshaire 23232, Kaieteur Plateau, rare to occasional, bush island on savanna, May 5, 1944, tree 10-12 m high, 25 cm diam., copious white latex, fruit subglobose, green, not quite ripe, seeds flat, oval, testa brown.

Discussion:

The species were originally described from Bahia, Brazil. Its appearance in the Guayana Highlands is most surprising. There is no record of its collection in the vast intervening area. The collections from Mt. Duida (Tatc 732, Steyermark 58243) are erroneously cited as C. utilis in Bull. Torrey Club 58: 2!)8, 453 (1931) and Pieldiana Bot. 28: 1043 (1957). The Ttate collection was discussed by Monachino in Lloydia 6: 239 (1943). Htcyc-rmark 58256, cited together with 58243 under C. utilis in Fieldiana, is probably the same, but the specimen was not seen by me. Steyermark 58243 contains flowers; the flowers are crowded in the inflorescence and the stigma-lobes are about 1 mm long, as previously described for the topotypical material. The calyx is puberulent. If the plants from Bahia and Guayana are not precisely identical, they certainly are very closely allied.

Distribution:Venezuela South America| Guyana South America|