Abstract
A new species or Yoania, Yoania flava, from southern Nagano, central Japan is described. The species has creamy yellow flowers and was formerly identified as Y. amagiensis from the Pacific Ocean side od Honshu. Yoania flava is morphologicically more similar to Y. japonica than to Y. amagiensis, but is distinguishable from Y.japonica by the nearly entire mid-lobe of the lip. DNA sequences from the ITS (internal transcribed spacer) region of the 18S-26S nuclear ribosomal DNA and rpL 16 intron further support the hypothesis that Y.flava is more akin to Y. japonica than to Y. amagiensis.
