A new Octomeria (Orchidaceae: Pleurothallidinae) and nomenclatural notes for related Southern Brazilian species

Octomeria imigiae is proposed as a new species from the Atlantic Rainforest of South Brazil. It is described, illustrated, and compared with sympatric and similar species. An identification key is provided. The new species is recognised by its reptant growth habit and tiny yellow flowers. It is similar to Octomeria chamaeleptotes and several other terete-leaved species from which it can be easily distinguished by its vegetative and floral morphology. Octomeria riograndensis and Octomeria sancti-angeli are proposed as new synonyms of Octomeria chamaeleptotes, and typification designations for this complex are made.

Automated summary

This study proposes a new species, Octomeria imigiae, from the Atlantic Rainforest of South Brazil. The species is described, illustrated, and compared with similar species found in the same region. An identification key is provided for distinguishing this new species. Octomeria chamaeleptotes and other terete-leaved species are similar to the new species, but can be easily differentiated by their vegetative and floral morphology. In addition, this study suggests the reclassification of Octomeria riograndensis and Octomeria sancti-angeli as synonyms of Octomeria chamaeleptotes, and establishes typification designations for this species complex.