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Journal of Plant Research

, Volume 114, Issue 2, pp 171–178 | Cite as

Flowering Phenology, Pollination, and Fruit Set of Cypripedium macranthos var. rebunense, a Threatened Lady's Slipper (Orchidaceae)

  • Naoto Sugiura
  • Taketoshi Fujie
  • Ken Inoue
  • Kenji Kitamura

Cypripedium macranthos

var. rebunense, was preliminarily studied on Rebun Island, Hokkaido, Japan, for conservation of this threatened orchid. The functional longevity of individual flowers varied from 0 to 18 days, a determining factor being the wind conditions at the growing sites. The flower was self-compatible but needed a pollen vector for fruit production. It lacked nectar and adopted a deceptive pollination system. Queens of a bumblebee, Bombus pseudo-baicalensis, were found to be pollinators but their visits were infrequent. Fruit set was 8.3% at one study site but only 1.2% at another, probably due to interference from the many visitors who came to see the flowers. Based on the results, conservation and management of lady's slipper were discussed. The need for less human interference and for preservation of the interactions between lady's slipper and its pollinator or other plant species with floral rewards is stressed.

Keywords: Bombus, Conservation, Cypripedium, Fruit set, Pollination 

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Copyright information

© The Botanical Society of Japan 2001

Authors and Affiliations

  • Naoto Sugiura
    • 1
  • Taketoshi Fujie
    • 1
  • Ken Inoue
    • 2
  • Kenji Kitamura
    • 3
  1. 1.Department of Environmental Science, Faculty of Science, Kumamoto University, Kumamoto, 860–8555 JapanJP
  2. 2.Biological Institute and Herbarium, Faculty of Science, Shinshu University, Matsumoto, 390–8621 JapanJP
  3. 3.Division of Environmental Biology, Faculty of Life and Environmental Science, Shimane University, Matsue, 690–8504 JapanJP

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