Hydnophytum (Psychotrieae Hydnophytinae) is revised. A key is provided, and an informal infrageneric grouping is proposed. Variation in tuber structure is discussed. Fifty-five species are recognised, of which 19 are described as new. For one species a number of varieties are also described. Forty-four species are found in New Guinea, of which 41 are endemic. The recent transfer of a number of taxa into an expanded concept of Squamellaria based on a molecular phylogeny is addressed. Three taxa of Squamellaria are included in this revision to complete the series of papers on the tuberous epiphytes of the Rubiaceae.

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Blumea: Biodiversity, Evolution and Biogeography of Plants

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Jebb, M., & Huxley, C. R. (2019). The tuberous epiphytes of the Rubiaceae 7: a revision of the genus Hydnophytum. Blumea: Biodiversity, Evolution and Biogeography of Plants, 64, 23–91. doi:10.3767/blumea.2019.64.01.02