2001 Volume 52 Issue 1 Pages 11-33
Keys, descriptions, taxonomical notes, and distribution maps are presented for the Japanese Phyllanthus which consists of 12 species belonging to four subgenera (Kirganelia, Eriococcus, Phyllanthus, Isocladus). A new subspecies, P. oligospermus Hayata subsp. donanensis T. Kuros., is described from Yonaguni Island in the Ryukyus. Two tropical or subtropical herbs, P. embergeri Haic. & Rossign. and P. urinaria L. subsp. nudicarpus Rossign. & Haic., are newly reported from Japan. The name, P. lepidocarpus Siebold & Zucc. (1845), is prior to P. hookeri Mull. Arg. (1863).