Taxonomy of Eupatorium section Verticillata (Asteraceae).
Item
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Title
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Taxonomy of Eupatorium section Verticillata (Asteraceae).
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Identifier
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AAI9207091
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identifier
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9207091
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Creator
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Lamont, Eric E.
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Contributor
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Adviser: Arthur Cronquist
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Date
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1991
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Language
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English
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Publisher
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City University of New York.
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Subject
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Biology, Botany
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Abstract
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Eupatorium section Verticillata, as delimited here, includes five species and three additional infraspecific taxa. The section is usually characterized by the occurrence of verticillate leaves, purplish flowers, and an enlarged style base. The species of section Verticillata are restricted to North America, with the greatest concentration of species in eastern United States. Recognition of species has always been difficult in the section because of variation in such features as shape of the leaves, number of leaves per node, pigmentation of the stems, size and shape of the inflorescence, and number of flowers per head. This variation was studied on the individual, inter- and intra-populational levels. Data collected from extensive field and herbarium studies were combines with the results of phenetic analysis to determine the usefulness of such characters for the determination of species.;A taxonomic treatment of the section is provided. Descriptions, keys, complete synonomy, illustrations, distribution maps, and discussions of all taxa are presented. Supplemental information (taxonomic history, ethnobotany, flavonoid chemistry, cytology, palynology, putative hybridization, and phylogeny) concerning the biology of section Verticillata is also presented.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
