Estudios sobre las Rubiáceas de México, LII

Abstract The Randia sepium is an extremely interesting species with its coriaceous medium-sized leaves glabrous and brilliant on both sides with 4–7 pairs of secondary nerves and terminal inflorescences, with medium-sized hirsute flowers and pubescent corolla lobes on both sides not having closely related taxon in the Mexican and Mesoamerican flora. All Randia species of these areas having coriaceous shiny leaves — e.g. R. cookii and R. chiapensis — are thorny small-leaved, nerveless, small-flowered ones with small glabrous, axillary or terminal solitary flowers. It is notable for its use, since it is applied as living fence in Chiapas (Mexico)

Una nueva especie del género Chomelia (Rubiaceae, Guettardeae) en México

Abstract A new species of Chomelia is described; at this time it has been collected only at the type locality. It is similar to the Mexican-Mesoamerican species Chomelia longituba (Borhidi) Borhidi, but can be easily distinguished by the position of the inflorescence, by the form of the stigma lobes and the size of the fruit

Psychotria inegi, una especie nueva en Jalisco (México)

Abstract The new Psychotria species belongs to the panamensis-mexiae complex with its large long deciduous ferrugineous terminal stipules, but differs from them by having shorter inflorescence, 2–3 times larger flowers, smaller leaves and less numerous secondary nerves. It is of allopatric distribution being endemic to Jalisco state, while the area of P. mexiae Standl. extends from Veracruz to Costa Rica and the populations of P. panamensis Standl. are found from Veracruz to Colombia

Los géneros Ceuthocarpus Aiello y Schmidtottia Urb. (Rubiaceae)

Schmidtottia Urb. (Rubiaceae, Condamineae) is an endemic genus of the old serpentine ranges (Sagua-Baracoa Massive) of Eastern Cuba in the West Indies containing 16 species and 4 subspecies according to Liogier (1962) and Borhidi (1980). Within the framework of the Flora of the Greater Antilles project a new taxonomic revision has been made with an amplified descriptions of the taxa and with some taxonomic modifications, e.g. Schmidtottia neglecta spec. nov. and a new analytic key for the genus. Ceuthocarpus was separated of Schmidtottia by Aiello (1979), as a monotypic endemic (C. involucratus) serpentinophilous genus of Eastern Cuba. Its variability range is described here distinguishing three varieties, var. involucratus, var. elatior and var. moaensis

Estudios sobre las Rubiáceas de México, L

Abstract The new Guettarda species of Oaxaca (Mexico) is related to G. foliacea Standl. of a distribution from Tabasco and Chiapas to Panama, but differs by having long acuminate and falcate leaves with lineolate quaternary nerves on the abaxial surface, inflorescences with very short ovate and glabrous bracteoles and much shorter flowers with 8–9 mm long corolla tube

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

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