The Andes and adjacent regions of western Amazonia are global centers of orchid diversity. Among the Andean countries, Bolivia remains the least well characterized as to its orchid flora, probably containing many new species awaiting description. During systematic studies of Microchilus (Orchidaceae: Orchidoideae: Cranichideae: Goodyerinae) and Pelexia (Orchidaceae: Orchidoideae: Cranichideae: Spiranthinae), it became apparent that two entities represented new species: Microchilus yungasensis from the Bolivian Yungas ecoregion, and Pelexia ocreatopsis from the Southern Amazon Humid Forests of Bolivia and Peru. Descriptions and morphometric analyses are provided for these new species. Dichotomous keys are provided for the Bolivian species of Microchilus, and Bolivian and Peruvian species of Pelexia.

中文翻译：

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来自玻利维亚和秘鲁的永加斯和亚马逊西部的 Microchilus 和 Pelexia（兰科）新种

安第斯山脉和亚马逊西部的邻近地区是兰花多样性的全球中心。在安第斯国家中，玻利维亚的兰花植物群仍然是最不明确的，可能包含许多等待描述的新物种。在对 Microchilus (Orchidaceae: Orchidoideae: Cranichideae: Goodyerinae) 和 Pelexia (Orchidaceae: Orchidoideae: Cranichideae: Spiranthinae) 的系统研究中，很明显两个实体代表了新物种：来自玻利维亚 Yungas 生态区的 Microchilus yungasensis 和来自南方的 Pelexia玻利维亚和秘鲁的亚马逊湿润森林。为这些新物种提供了描述和形态测量分析。为玻利维亚的 Microchilus 物种以及玻利维亚和秘鲁的 Pelexia 物种提供了二分键。