Monadelpha L.J.Gillespie & Card.-McTeag., gen. nov., is described as a new member of Euphorbiaceae tribe Plukenetieae subtribe Tragiinae, to accommodate Tragia guayanensis, a species known from western Amazonas, Venezuela and, newly reported here, from Amazonas, Brazil. The genus is unique in the subtribe for having 5-colpate pollen and staminate flowers with filaments entirely connate into an elongate, cylindrical staminal column terminated by a tight cluster of anthers. Phylogenetic analyses based on nuclear rDNA ITS and sampling 156 accessions across the diversity of Tragiinae (all 12 genera and 77 of ~195 species) also support Monadelpha as a distinct lineage that is separate from Tragia. A revised key to the genera of Tragiinae in South America and Central America is provided.

中文翻译：

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Monadelpha（大戟科，Plukenetieae），来自委内瑞拉和巴西亚马逊雨林的Tragiinae新属

Monadelpha LJGillespie & Card.-McTeag., gen. 11 月，被描述为大戟科部落 Plukenetieae 亚部落 Tragiinae 的新成员，以容纳 Tragia guayanensis，这是一种在委内瑞拉亚马逊西部已知的物种，并在此处新报道，来自巴西亚马逊。该属在亚部落中是独一无二的，它具有 5-colpate 花粉和雄花，花丝完全合生为细长的圆柱形雄蕊柱，末端为紧密的花药簇。基于核 rDNA ITS 的系统发育分析和对 Tragiinae 多样性的 156 个种质进行采样（所有 12 属和 77 个 ~195 种）也支持 Monadelpha 作为一个与 Tragia 不同的独特谱系。提供了南美洲和中美洲 Tragiinae 属的修订密钥。