Abstract:
:The neotropical shrub Pentagonia macrophylla Benth. (Rubiaceae) has protandrous two-day flowers. Synchronous development among flowers on a single individual results in sequential phenotypic unisexuality: the entire plant alternates gender from day to day. Pistillate flowers produce more nectar than staminate flowers at comparable hours, but this difference does not result in different paterns of visitation to male and female flowers by hummingbird pollinators. Rare periods of bisexuality occur due to asynchronous floral development within or between inflorescences and are always followed by return to a synchronized pattern of alternation of gender. Reestablishment of synchrony usually involves a timeframe shift in the pattern of flowering (i.e., a plant produces staminate flowers on days when it previously would have been pistillate). It is suggested that timeframe shifts occur in response to inadequate pollination and serve to either desynchronize the plant from neighboring conspecifics or to temporarily allow self-pollination.
journal_name
Oecologiajournal_title
Oecologiaauthors
McDade LAdoi
10.1007/BF00384790subject
Has Abstractpub_date
1986-01-01 00:00:00pages
218-223issue
2eissn
0029-8549issn
1432-1939pii
10.1007/BF00384790journal_volume
68pub_type
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