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"Floral Morphology, Pollination Mechanisms, and Phylogenetics of Pleurothallis Subgenera Ancipitia and Scopula"

by Dupree, Katharine Elizabeth

Abstract

Pleurothallis is the largest myophilous (fly-pollinated) genus in subtribe Pleurothallidinae. Although many studies show highly specific relationships in pollination systems in the Orchidaceae, our understanding of these relationships in myophilous orchids is almost non-existent (Borba & Semir 2001). This study focuses on the floral micromorphology, specifically the lip and column, of species within subgenera Ancipitia and Scopula. Scanning electron microscopy of the micromorphology of floral structure shows a range of morphology and pollination mechanisms within the two studied subgenera. These include deceit pollination by pseudocopulation and reward pollination. In concert, phylogenetic analysis was performed to determine if a correlation existed between morphology or pollination mechanism and taxonomic groupings. Maximum parsimony trees were produced using ITS and matK sequences for subgenera Ancipitia, Scopula, and Pleurothallis, with species from the genera Laelia, Pabstiella, and Arpophyllum as outgroups. The ITS, matK and combined trees strongly support an Ancipitia/Scopula section within a monophyletic subgenus Pleurothallis. Within this section, both reward and deceit pollination mechanisms are found, meaning they are not restricted to the current taxonomic groupings. Morphological and genetic data therefore support the grouping of subgenera Ancipitia, Scopula, and Pleurothallis into one monophyletic subgenus.

Note

The author has given permission for this work to be deposited in the Digital Archive of Colorado College.

Colorado College Honor Code upheld.

Includes bibliographical references.

Administrative Notes

The author has given permission for this work to be deposited in the Digital Archive of Colorado College.

Colorado College Honor Code upheld.

Copyright
Copyright restrictions apply.
Publisher
Colorado College
PID
coccc:26399
Digital Origin
born digital
Extent
47 pages : illustrations
Thesis
Senior Thesis -- Colorado College
Thesis Advisor
Brandley, Nicholas Wilson, Mark
Department/Program
Organismal Biology and Ecology
Degree Name
Bachelor of Arts
Degree Type
bachelor
Degree Grantor
Colorado College
Date Issued
2016-05