Systematics Section / ASPT
Monfils, Anna K. , Prather, L. Alan .
Taxonomy, Phenology and Floral Morphological Variation of Populations of Pedicularis densiflora.
AN extensive examination was undertaken to detect and explain patterns of infraspecific variation among populations of Pedicularis densiflora, including populations formerly recognized as P. densiflora subsp. aurantiaca and P. densiflora subsp. densiflora. Several statistical analyses (UPGMA, ANOVA, and PCA) were conducted on floral traits measured in the field. All three statistical analyses indicated differences in floral morphology among populations. These differences were confirmed by a review of over 1000 herbarium specimens. This work revealed two series of populations that are morphologically distinct from each other, and correspond to the circumscriptions of the two subspecies. Populations within each series are morphologically cohesive, suggesting that P. densiflora should be more narrowly circumscribed and that P. densiflora subsp. aurantiaca should be elevated to species status. The new species had large calyces, floral tubes included at anthesis, reduced lower labia, and enlarged galea openings. The plants formerly treated as Pedicularis densiflora subsp. densiflora had short calyces with fully exserted floral tubes, enlarged lower labia, and smaller galea openings. The taxonomy, phenology and floral differences correspond to previously published data on pollinator visitation.
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1 - Central Michigan University, Biology, 125 Brooks Hall, Mount Pleasant, Michigan, 48859, USA
2 - Michigan State University, Department of Plant Biology, Herbarium, 166 Plant Biology Wilson Road, East Lansing, Michigan, 48824-1312, USA
Presentation Type: Oral Paper:Papers for Sections
Location: 144/Performing Arts Center
Date: Tuesday, August 1st, 2006
Time: 4:45 PM