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10 August 2015 Gradyana (Euphorbiaceae): A New Genus from Northeastern Brazil
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Abstract

Gradyana franciscana, a new genus and species of Euphorbiaceae found in the São Francisco river valley, in the semiarid region of northeastern Brazil, is herein described and illustrated. Gradyana is morphologically close to Stillingia due to the presence of carpidiophore and foliar glands, but differs in possessing strictly axillary sinuous thyrsoid staminate inflorescences, solitary pistillate flowers, apical glands in the bracts, long-stipitate glands between pistillate sepals, and staminate flowers with three stamens and three sepals. A key to differentiate Gradyana from other genera of the tribe Hippomaneae occurring in South America is presented. Comments about its geographic distribution, habitat, and conservation status are also provided.

© Copyright 2015 by the American Society of Plant Taxonomists
Sarah Maria Athiê-Souza, André Laurênio de Melo, Marcos José da Silva, Luciana dos Santos Dias de Oliveira, and Margareth Ferreira de Sales "Gradyana (Euphorbiaceae): A New Genus from Northeastern Brazil," Systematic Botany 40(2), 527-533, (10 August 2015). https://doi.org/10.1600/036364415X688781
Published: 10 August 2015
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