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Free Content A new rheophytic (Rubiaceae) from southern Cameroon Un nouveau Psychotria (Rubiaceae) rhéophyte du sud Cameroun

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– A new species of (Rubiaceae) from Cameroon is described and illustrated, in the framework of a regional revision of the genus. – Normal practices of herbarium taxonomy have been applied. – O. Lachenaud & Séné is remarkable in its rheophytic habit, narrowly lanceolate leaves, and in having very large flowers for the genus. It is closely related to (DC.) Roberty, from which, in addition to flower size, it also differs in having smooth pyrenes and fewer-flowered inflorescences. The species is only known from the Ntem river valley near Nyabessan. Since the construction of a dam is scheduled in the region, the species is considered as Critically Endangered (CR B1a, b(iii)) according to IUCN criteria.

Contexte – Une nouvelle espèce de Psychotria (Rubiaceae) du Cameroun est décrite et illustrée, dans le cadre d'une révision régionale du genre.

Méthodes – Les méthodes usuelles de taxonomie d'herbier ont été appliquées.

Résultats principauxPsychotria torrenticola O. Lachenaud & Séné est remarquable par son habitat rhéophyte, ses feuilles étroitement lancéolées, et ses fleurs très grandes pour le genre. Voisin de P. psychotrioides (DC.) Roberty, il en diffère, outre la taille des fleurs, par les noyaux lisses et les inflorescences à fleurs moins nombreuses. L'espèce n'est connue que de la vallée du Ntem aux environs de Nyabessan. La construction d'un barrage étant prévue dans cette région, P. torrenticola est considéré comme En danger critique d'extinction (CR B1a, b(iii)) selon les critères de l'UICN.

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Language: French

Document Type: Short Communication

Publication date: 01 November 2012

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  • Plant Ecology and Evolution (a continuation of Belgian Journal of Botany, incorporating Systematics and Geography of Plants) is an international journal devoted to ecology, phylogenetics and systematics of all ‘plant' groups in the traditional sense (including algae, cyanobacteria, fungi, myxomycetes), also covering related fields such as comparative and developmental morphology, conservation biology, evolution, phytogeography, pollen and spores, population biology, and vegetation studies. It is published by the Royal Botanical Society of Belgium and contains original research papers, review articles, checklists, short communications and book reviews.

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