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A Phytogeographically Significant New Species of Jatropha (Euphorbiaceae) from Costa Rica

Grady L. Webster and Luis J. Poveda
Brittonia
Vol. 30, No. 2 (Apr. - Jun., 1978), pp. 265-270
Published by: Springer on behalf of the New York Botanical Garden Press
Stable URL: http://www.jstor.org/stable/2806661
Page Count: 6
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A Phytogeographically Significant New Species of Jatropha (Euphorbiaceae) from Costa Rica
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Abstract

Jatropha costaricensis is described from Guanacaste, Costa Rica and assigned to sect. Platyphyllae. It is most similar to J. alamanii of the Isthmus of Tehuantepec in Mexico, and represents part of a secondary Central American radiation of xeric-adapted Euphorbiaceae. Its geographic relationships indicate a formerly more widespread occurrence of a tropical deciduous flora in Mesoamerica, and it is suggested that xeric range disjunctions here and in adjacent South America may be largely due to climatically-induced extinction rather than to long-distance dispersal.

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