Revisión crítica del género Rogiera Planch. (Rubiaceae, Guettardeae) y la validez del género Rovaeanthus Borhidi (Rubiaceae, Rondeletieae)

Borhidi, A. L. (2018) Revisión crítica del género Rogiera Planch. (Rubiaceae, Guettardeae) y la validez del género Rovaeanthus Borhidi (Rubiaceae, Rondeletieae). Acta Botanica Hungarica, 60 (1-2). pp. 13-29. ISSN 0236-6495

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Abstract

The last synthetic treatment of the Rogiera genus was published by D. Lorence in the Flora Mesoamericana (Vol. 4, part 2) based on a polyphyletic concept including two genera of different tribes and leaving the results of the molecular studies out of consideration or misinterpreting them (Lorence 2012). Rovaeanthus has been distinguished at first by Johan Rova upon comparative molecular studies (Rova 1999, Rova et al. 1999, 2002). Micro- and macromorphological studies revealed that the basic differences between Rogiera and Rovaeanthus are in the structure of the flowers and the shape and cell-patterns of the seeds as they were correctly presented and illustrated by Borhidi (2006, 2012) and Borhidi et al. (2004). These are: Rovaeanthus has a special form of corolla-throat, consisting of fleshy ring – as in Rondeletia – and a superposed hairy ring, like in Rogiera. This combination of the corolla-features is unique in the Neotropical Rubiaceae. Anthers are subbasal in Rovaeanthus, dorsifixed in the middle in Rogiera. Ovary disc with naked ring in Rogiera and hairy in Rovaeanthus. Shape and ornamentation of the seeds are completely different in the two genera (see below). In these features there are not any intermediate variation, between the two taxonomic units as it is suggested by Lorence. The present treatment is based on the original strictly monophyletic concept of Rogiera pointed out by Planchon (1849) and detailed by Borhidi (1982) and Borhidi et al. (2004) including into the study all (15) valid species of Rogiera and two species of Rovaeanthus. The separation of the two genera has been confirmed by later, more detailed molecular studies (Manns and Bremer 2010, Rova et al. 2009) establishing that the two genera belong to two different tribes: Rogiera belongs to Guettardeae, while Rovaeanthus is a member of the Rondeletieae tribe. It is important to mention, that Rovaeanthus was originally accepted as a valid genus by the World checklist of Rubiaceae (2006) and later has been re-classified into Rogiera in 2012, under the influence of the Lorence’s inaccurate treatment.

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