Spiranthes hongkongensis S. Y. Hu & Barretto (Orchidaceae): Newly Discovered Orchid on Ishigaki Island, Ryukyu Islands, Japan

The discovery of Spiranthes hongkongensis S. Y. Hu & Barretto (Orchidaceae) on Ishigaki Island, Japan, during herbarium studies in KPM is reported. Previously, S. hongkongensis was reported only from China (Guangdong, Hong Kong, Taiwan), and Malaysia (Borneo). Spiranthes hongkongensis is morphologically similar to S. australis, but is distinguishable by the membranous, narrow, truncate rostellum attached to the middle of the pollinia without a viscidium, shorter column and distinctly 3-lobed stigma.