Guido Mathieu

Taxonomy of the Peperomia species (Piperaceae) with pseudo‐epiphyllous inflorescences, including four new species

Twelve of the estimated 1500–1700 taxa in Peperomia show a particular feature: their terminal inflorescences seem to originate from the base of a leaf blade as a result of the presence of a sessile leaf at the base of these inflorescences. Three of these 12 taxa occur in Ecuador and four species are reported from Colombia. From Peru, two species are known from historical herbarium collections, and three other species are new to science. One new species is described from Bolivia. Collections of all 12 species are quite rare and, in the past, their identification seems to have been rather problematic. Previous authors have referred to these inflorescences as epiphyllous but, as shown here, this is not a correct description. To make a clear distinction from genuine epiphyllous inflorescences, the term ‘pseudo‐epiphyllous’ is proposed. In addition to the publication of four new species of Peperomia, emended descriptions are provided for the other species, synonymy is treated, and lectotypes are designated. The architecture of the plants is discussed and a key to the 12 species is provided. © 2008 The Linnean Society of London, Botanical Journal of the Linnean Society, 2008, 157, 177–196.

Diversity, Distribution, and Conservation Status of Peperomia (Piperaceae) in the State of Veracruz, Mexico:

We present an overview of the diversity, distribution, and conservation status of all 60 species of the genus Peperomia (“radiator plants,” Piperaceae), which are currently known from the state of Veracruz in Mexico, including a taxonomically updated reference list that includes information about life form, overall distribution, endemism, and occurrence in Mexican states and municipalities of Veracruz. Specifically, for this latter state, we provide information on elevational range, habitat, and distinguishing characters useful for identification or uses. Moreover, we realize an assessment of conservation status considering International Union for Conservation of Nature Red List categories and criteria at regional level. About 45% of Peperomia species from Veracruz belong to a threatened category, mainly because of the continued loss and fragmentation of natural habitats.

Peperomia tubericordata (Piperaceae), a new geophytic species from Oaxaca, Mexico

A new Peperomia species from the state of Oaxaca, Mexico is described and illustrated. It shows the typical morphological characters of subgenus Tildenia (presence of an underground tuber and leaves and inflorescences directly originating from that tuber), but differs from all other members of that subgenus by the orbicular to reniform, cordate, non-peltate leaves.

Lectotypifications of Peperomia species (Piperaceae) from Veracruz, Mexico

Abstract Mathieu, G. & M.W. Callmander (2017). Lectotypifications of Peperomia species (Piperaceae) from Veracruz, Mexico. Candollea 72 : 333–338. In English, English abstract. An upcoming taxonomic treatment accepts 60 species of Peperomia Ruiz & Pavón (Piperaceae) from the state of Veracruz in Mexico. A total of 19 species needed a nomenclatural act. Lectotypes of four species were designated previously and the remaining 15 species are lectotypified here. Each of them is discussed in detail. Ten of these species were described by Casimir de Candolle (1836–1918) and some comments on the G herbaria, housing most of Candolles types, are provided. Received: June 13, 2017; Accepted: July 4, 2017; First published online: July 20, 2017