Delprete, Piero G., 2019, Notes on calycophyllous Rubiaceae. Part V. A succinct overview of genera with calycophylls, and a revision of Pteridocalyx (Sipaneeae) with observations on distyly and calycophyll variation

Delprete, Piero G., 2019, Notes on calycophyllous Rubiaceae. Part V. A succinct overview of genera with calycophylls, and a revision of Pteridocalyx (Sipaneeae) with observations on distyly and calycophyll variation, Phytotaxa 391 (1), pp. 81-92

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https://doi.org/10.11646/phytotaxa.391.1.6

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https://doi.org/10.11646/phytotaxa.391.1.6

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