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Primitive Forest Grasses and Evolution of the Bambusoideae

Thomas R. Soderstrom and Cleofé E. Calderón
Biotropica
Vol. 6, No. 3 (Sep., 1974), pp. 141-153
DOI: 10.2307/2989646
Stable URL: http://www.jstor.org/stable/2989646
Page Count: 13
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Primitive Forest Grasses and Evolution of the Bambusoideae
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Abstract

Eastern Brazil, particularly the region around Bahia, harbors many primitive herbaceous bambusoid grasses. In the tribe Olyreae, the genus Piresia is represented by several new species, all less advanced than those of Amazonia. The species of Diandrolyra found in Bahia show more primitive features than those which occur to the south. The tribe Parianeae, previously known only by the genus Pariana, which occurs throughout Amazonia, is represented by two new genera from eastern Brazil. At least one of these exhibits the most primitive features in the tribe. These preliminary findings suggest that the Bahian region is a refugium of at least some primitive herbaceous bambusoid grasses, and that migration proceeded from here southward along the Serra do Mar and northwestward into Amazonia.

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