The taxonomic revision of Sobralia Ruiz & Pav. (Orchidaceae) in the Guyanas (Guyana, Suriname, French Guiana).

This paper presents a taxonomic revision of species of the genus Sobralia (Orchidaceae) in the Guyanas (Guyana, Suriname & French Guiana) based on an extensive study of herbarium material. Descriptions of their morphology, ecology and distribution are included and supported by illustrations of their habits and floral parts. A determination key is provided. Sobralia agnieszkae Baranow and Sobralia romeroana Baranow & Szlach.-two new species of the genus discovered among material collected in Guyana-are described. Including the newly described taxa, 14 species of the genus occur in the study area and, based on literature data, two further species ( S. crocea (Poepp. & Endl.) Rchb.f. and S. fimbriata Poepp. & Endl.) are expected to be found there. [ABSTRACT FROM AUTHOR]