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AOBPreview published online on June 12, 2003
Annals of Botany, doi:10.1093/aob/mcg124
© 2003 by Annals of Botany Company
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Submitted on January 22, 2003
Revised on March 18, 2003
Accepted on April 16, 2003

Floral Longevity and Nectar Secretion of Platanthera chlorantha (Custer) Rchb. (Orchidaceae)

MALGORZATA STPICZYNSKA1*

Affiliation of the authors: 1 Department of Botany, Agricultural University in Lublin, ul. Akademicka 15, 20-950 Lublin, Poland

* To whom correspondence should be addressed. E-mail: msbot{at}agros.ar.lublin.pl.

Flowering and nectar secretion were studied in Platanthera chlorantha in two years. Nectar was secreted and accumulated in this orchid's spur, originating from part of the labellum. The nectary spur was, on average, 32 mm long. It produced 6·86 µl nectar in 1999 and 7·84 µl in 2000. The number of flowers per inflorescence and the volume of nectar secreted per flower were not correlated. Nectar secretion and flower longevity differed depending on pollination and flower position in the inflorescence. Among pairs of pollinated and unpollinated flowers there was no difference in the volume of nectar produced; however, the life span of pollinated flowers was shorter than that of unpollinated ones. Within an inflorescence, the lowest-positioned flowers had the largest nectar production and the longest life compared with flowers positioned higher up.
Key words: Orchidaceae, Platanthera chlorantha, flower longevity, nectar secretion, nectary spur, pollination.


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