Estudios sobre Rubiáceas Mexicanas XVI. Psychotria lozadae una especie nueva en la flora del estado Guerrero

Borhidi, A. and Lorea-Hernández, F. (2008) Estudios sobre Rubiáceas Mexicanas XVI. Psychotria lozadae una especie nueva en la flora del estado Guerrero. Acta Botanica Hungarica, 50 (3-4). pp. 281-285. ISSN 0236-6495

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Abstract

The exploration of the extremely rich Mexican flora stepped into a more intensified phase according to the decisions and recommendations of the XVI. Mexican Botanical Congress (Oaxaca, 2004). Within the framework of the studies in the Rubiaceae family three kinds of activities has been required: 1) To summarise the existing knowledge about the taxonomy of the family giving a stable base for the further explorations. 2) Extension of the collecting activity. 3) Revision of the collections of the different federal institutions, universities and local authorities or societies. For fulfilling the first requirement, the monographic treatment of Rubiáceas de México was published by the Akadémiai Kiadó, in 2006. For the further requirements new, hitherto not visited areas have been collected in different states and also several institutional and regional collections have been revised and determined (e.g. Flora of the state Guerrero of the UNAM, SERBO de Oaxaca, INEGI, Universities of Tabasco, Querétaro, Aguascalientes) and naturally the materials of the central collections of México (MEXU, FCME, ENCB). For publishing the new findings a series of articles started in 2003, with the title: Estudios sobre Rubiáceas Mexicanas . The results of the first ten articles of the series are included into the monograph, but the new taxa published after 2006 are additional data, not included into the Rubiáceas de México . A new addition to the knowledge of the Mexican Rubiaceae is the Psychotria lozada e a small-leaved creeping subshrub of the high mountain evergreen forests of the Sierra Madre del Sur in Guerrero, with an uncommon habit. It belongs to the subgenus Heteropsychotria , by its bilobulate, permanent stipules. The most closely related species is P. minarum Standl. et Steyerm. of Guatemala, which differs from our species by its longer petioles, elliptic, nigrescent leaves, with obsolete or inconspicuos, nerves, corymbose and glabrous inflorescences, sessile or subsessile, 5-merous flowers, and glabrous hypanthium. The species is dedicated to Lucio Lozada-Pérez, the excellent collector and expert in the Spermacoceae tribe of Rubiaceae.

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