, Volume 66, Issue 2, pp 134–150 | Cite as

Three new species and a revised key to species of Oxalis section Polymorphae (Oxalidaceae)

  • Pedro Fiaschi


Three new species of Oxalis sect. Polymorphae are here described and illustrated: Oxalis artemioides, O. calcicola, and O. monochasiata. These species have narrow geographic distributions, each being known from just one location. Oxalis artemioides differs from other species of the section by the glabrous stem, narrow terminal leaflets (8–10.5 × 2 mm), and inflorescences with elongated dichasial branches bearing flowers only in the distal portion. Oxalis calcicola differs from other species by having the young stem with adpressed-retrorse trichomes, inflorescences shorter than adjacent leaves, short dichasial branches (0.5–3 mm long) with flowers densely grouped along the entire length, and glabrous pedicels. Oxalis monochasiata is remarkable because of its monochasial inflorescence and the two-ovulate carpels, both features unique within Oxalis sect. Polymorphae. The new species are compared to similar species of the section, and information on distribution and habitat, phenology, and conservation status according with IUCN criteria are provided. Geographic distribution maps, lists of examined materials and an identification key for species of this section are also presented.

Key words

Bahia Brazil Goiás Minas Gerais South America taxonomy 



Financial support for this study was provided by Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP, grant # 2010/02814-7). I am grateful to Donald McClelland and an anonymous reviewer for their suggestions, to the curators of the herbaria I visited for sending loans of specimens for this study, and to Rogério Lupo for the drawings.

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Copyright information

© The New York Botanical Garden 2013

Authors and Affiliations

  1. 1.Departamento de Botânica, Centro de Ciências BiológicasUniversidade Federal de Santa CatarinaFlorianópolisBrazil

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