Acianthera

Identification key to the Acianthera of Brazilian Amazon 1. Inflorescence 1 or 2-flowered ........................................................................................................... 2 – Inflorescence with more than 2 flowers ............................................................................................ 7 2. Caespitose (internodes of rhizomes 10 mm long)................................................................ 3 3. Lamina ovate ................................................................................... A. discophylla Luer & Carnevali – Lamina large-elliptic, elliptic, oblong, lanceolate or linear............................................................... 4 4. Lamina large-elliptic, dorsal sepal spatulate........................................................................................ ..................................................................... A. yauaperyensis (Barb.Rodr.) Pridgeon & M.W.Chase – Lamina large-elliptic, elliptic, oblong, lanceolate or linear, dorsal sepal linear or lanceolate ......... 5 5. Dorsal sepal with the same length of the lateral sepals .................. A. silvae (Luer & Toscano) Luer – Dorsal sepals twice the length of the lateral sepals A. miqueliana (H.Focke) Pridgeon & M.W.Chase 7. Inflorescence surpassing the lamina length. A. ciliata (Knowles & Westc.) F.Barros & L.Guimarães – Inflorescence shorter than the lamina length ..................................................................................... 8 8. Plants higher than 12 cm tall, stem longer than the lamina............................................................... 9 – Plants up to 12 cm tall, stem shorter than the lamina ...................................................................... 10 9. Lateral sepals oblong ................................................. A. casapensis (Lindl.) Pridgeon & M.W.Chase – Lateral sepals elliptic ........................................................ A. fockei (Lindl.) Pridgeon & M.W.Chase 10. Sepals with equal length, apical lobe of the lip with fringed margin A. amazonica Marcusso sp. nov. – Lateral sepals longer than the dorsal, apical lobe of the lip with serrate margin ....................................................................... A. saraca-taquerensis Campacci & J.B.F.Silva