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New species O. rhea and O. stygis are described in Borneo, suggesting diversity in Araceae.
Ooia rhea and O. stygis are described as new species from, respectively, Paleogene shales in Kalimantan Utara and Palaeogene granites in Kalimantan Barat, Indonesian Borneo, and together taking the genus to fourteen species. A comparative figure of the spadix, the definitive means to delimitate species, of all species is provided and both proposed novelties are illustrated from living plants.
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Yeng et al. (2026) studied this question.
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