O gênero Oxalis L. (Oxalidaceae) no Rio Grande do Sul, Brasil.

Abstract

This works aims at caring out the survey of the genus Oxalis in the state of Rio Grande do Sul, offering means for the species identification. This study was carried out based on review of specialized literature and specific websites in the field of taxonomy; revision of the Herbarium; and field work, throughout the state. In Rio Grande do Sul, the genus Oxalis is represented by 27 species: Oxalis articulata Savigny, O. bifrons Progel, O. bipartita A. St.-Hil., O. brasiliensis G. Lodd., O. conorrhiza Jacq., O. corniculata L., O. cytisoides C. Mart. & Zucc., O. debilis Kunth, O. eriocarpa DC., O. floribunda Lehm., O. geralensis R. Knuth, O. hispidula Zucc., O. lasiopetala Zucc., O. latifolia Kunth, O. linarantha Lourteig, Oxalis lindneri R. Knuth, O. myriophylla A. St.-Hil., O. niederleinii R. Knuth, O. paludosa A. St.-Hil., O. perdicaria (Molina) Bertero, O. potamophila Lourteig, O. refracta A. St.-Hil., O. sarmentosa Zucc., O. sellowiana var. alba Múlgura, O. subvillosa Norlind, O. tenerrima R. Knuth e O. triangularis A. St.-Hil. One of these species is a new occurrence in Rio Grande do Sul State, Oxalis subvillosa. Other of them, Oxalis lindneri, is a new record in Brazil. Analytical key, morphological descriptions, illustrations and data concerning the habitat, distribution, flowering and fruiting period are supplied.