Jablonskia, a New Genus of Euphorbiaceae from South America

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Abstract
A new monotypic genus, jablonskia, based on the South American Securinega congesta (Euphorbiaceae, Phyllanthoideae), resembles genera of the Antidesmeae in pollen and wood characters, but the floral structure is more similar to that in genera of Aporuseae such as Ashtonia and Richeria. From Securinega, where it was originally placed, and the taxa of Antidesmeae and Aporuseae, Jablonskia may be separated by a combination of characteristics: monoecious; inflorescences axillary; flowers conspicuously bracteate, the staminate sessile; pollen grains prolate, exine tectate-perforate, germ pore lalongate; seeds with fleshy exotesta, paired in each locule of the irregularly dehiscing capsule; embryo with radicle equalling the cotyledons.

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