A New Peloric Form of <i>Cephalanthera erecta </i>(Orchidaceae) from Japan

  • Hayakawa Hiroshi
    Museum of Natural and Environmental History, Shizuoka
  • Suetsugu Kenji
    Department of Biology, Graduate School of Science, Kobe University
  • Fujimori Shohei
    Graduate School of Life and Environmental Sciences, University of Tsukuba (present address: Department of Horticulture, Kochi Prefectural Makino Botanical Garden)
  • Shitara Takuto
    Graduate School of Life and Environmental Sciences, University of Tsukuba Iriomote Station,Tropical Biosphere Research Center, University of the Ryukyus (present address: Institute of Agriculture, Tokyo University of Agriculture and Technology)
  • Yokoyama Jun
    Faculty of Science, Yamagata University
  • Yukawa Tomohisa
    Tsukuba Botanical Garden, National Museum of Nature and Science


A new peloric form of Cephalanthera erecta (Thunb.) Blume (Orchidaceae) is reported from Hokkaido, Honshu, and Shikoku, Japan. Cephalanthera erecta f. pelorica Hiros. Hayak. & Suetsugu has an inconspicuous lip and stigmas positioned at the apex of the column. The flowers of C. erecta f. pelorica resemble those of the probable peloric form of C. erecta (i.e., C. erecta var. oblanceolata N. Pearce & P. J. Cribb, C. nanlingensis A. Q. Hu & F. W. Xing) and C. longifolia (L.) Fritsch. f. conformis Suetsugu & Hiros. Hayak. However, C. erecta f. pelorica can be distinguished from C. erecta var. oblanceolata, which has a swollen organ on the abaxial surface of the column apex (vs. no swollen organ); C. nanlingensis, which has two staminodes (vs. five staminodes), and C. longifolia f. conformis, which has elliptic, coriaceous leaves (vs. lanceolate, papyraceous leaves).


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