A taxonomical study of Bipinnula (Orchidaceae: Chloraeinae) in Argentina
19 October 2014
Sanguinetti, AgustÃn; Buzatto, Cristiano; Singer, RodrigoA taxonomic synopsis of Bipinnula Comm. ex Juss. (Orchidaceae: Chloraeinae) in Argentina is presented. Three species are recognized for the Argentinean Flora: B. biplumata Rchb.f., B. penicillata (Rchb.f.) Cisternas & Salazar and B. polysyka Kraenzl. An artificial key to set apart these species and a national occurrence map are included. All these species are described in detail and photographs of diagnostic vegetative and floral features, as well as distributional, ecological and nomenclatural comments are given. Lectoypes for the basionyms Arethusa biplumata L.f., Chloraea arechavaletae Kraenzl. and B. polysyka Kraenzl. are designated. All studied species are terrestrial orchids that dwell in grasslands of the heavily transformed Pampas biome; two of them are restricted to a few counties. Therefore, an assessment on their conservation status is urgently needed