Geographical distribution of «Petalostelma robertii» (Apocynaceae) in the Gran Chaco and its interest for ethnobotany

Abstract

This paper discusses the role played by Petalostelma robertii (S. Moore) Liede & Meve (Apocynaceae) in the ethnobotany of two ethnic groups from the Argentine semi-arid Chaco: the Wichí and the Toba-Pilagá peoples, who use it as a love spell. It provides data on the morphology, ecology and geographical distribution of the plant, as well as references on its significance in the social and spiritual lives of these ethnic groups. Its presence in Argentina is mentioned for the first time, and the morphological similarities and discrepancies in the collections made in different localities in the region are discussed. The provisional nature of the identity given to the plant is categorically stated. Its ethnobotanical interest and the need to assign a scientific name to the plant, at least an approximate one, are discussed. On the taxonomic and floral levels, the conclusion is that a detailed study of the exsiccata available is required in order to clarify the identity of a group of plants related to P. robertii