Implications of geitonogamous pollination for floral longevity in Iris gracilipes

  • Ishii H
  • Sakai S
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Abstract

1. We analysed the longevity of indivN1ual flowers and the effect on pollination success
with respect to floral display size of racemes (number of flowers open at one time) for
the sequentially blooming plant Narthecium asiaticum (Liliaceae). The longevity of
lower- and mN1dle-positioned flowers (about 7 days in 1998 and 6 days in 1999) was
much greater than the length of time required for the completion of male (about 3 days)
and female (within 3 days) functions.
2. We suggest that such prolonged longevity benefits the plant in terms of pollinator
attraction, because prolonged longevity in lower and mN1dle flowers leads to large
display sizes of racemes. Increased display size would not have resulted in an increase
of geitonogamy in this species, because most pollinators left racemes after probing
only one flower. Rather, large displays attracted more pollinators and increased pollen
dispersal from indivN1ual flowers.
3. The longevity of upper-positioned flowers (about 4 days in 1998 and 3 days in 1999)
was less than that of lower- and mN1dle-positioned flowers - almost the same as the
length of time required for the completion of male and female functions. This difference

Author-supplied keywords

  • Blooming schedule
  • Display size
  • Spatial arrangement

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Authors

  • H. S. Ishii

  • S. Sakai

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