Resumen

PAZ DEBLE, Leonardo; DA SILVA ALVES, Fabiano  y  DE OLIVEIRA-DEBLE, Anabela S. Three new species of the genus cypella (Iridaceae, tigridieae). Darwiniana, nueva serie [online]. 2015, vol.3, n.2, pp.235-253. ISSN 0011-6793.

Three new species of Cypella section Nais from South America are described and illustrated: C. charruana, C. gloriana, and C. uliginosa. Cypella charruana occurs in Santana do Livramento (southern Brazil) and in Rivera and Artigas (northern Uruguay). It is related to C. suffusa; however, it can be easily separated by its one-flowered spathes, outer tepals with narrowed claws, longer antheral filaments, and bigger anthers. Cypella gloriana is only found in São Vicente do Sul (central-western Rio Grande do Sul State, Brazil); this species is closely related to C. pusilla from which it can be separated by its larger perigone with shallower and broader concavity, outer tepals with narrowed claws, inner tepals with blades markedly narrowed and longer towards the apex, and with glandular trichomes spreading in a small area, stamens shorter, with porrect filaments, smaller anthers, and broader connective tissue. Cypella uliginosa occurs in bogs from Entre Ríos and Corrientes in northeastern Argentina; it morphologically resembles C. crenata and C. laxa; however, C. uliginosa can be distinguished from both species by its flowers with pale translucent and shallow central concavity, inner tepals blade plicate with a deep central depression, marked by a darker area covered by ochraceous glandular trichomes, and erect or slightly porrect style branches, with the stigmatic trichomes prolonged on the proximal portion of the adaxial crests. Cypella charruana and C. gloriana are recognized as critically endangered, while the data of C. uliginosa are insufficient to establish criteria of threat. Data about phenology, geographic distribution, conservation, plus comparative tables to segregate these three new species from the related taxa, and a key to differentiate species of the section Nais are supplied.

Palabras clave : Bulbous; Geophyte; Grasslands; Taxonomy.