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Abstract Detail


Systematics Section

Jenkins, Philip [1].

How many Browallia are there?

Historically the genus Browallia (Solanaceae) has contained approximately 40 names attached to it including both legitimately published and unpublished names. Some later were placed in other families. Most of the “taxa” seem to apply to broad variation within Browallia americana L. named historically as early botanical explorers of South America encountered the highly variable plants ranging from the dry coast of Northern Peru into the Andes, the Amazon Basin thence north to Panama and Costa Rica. Early taxonomists attempted to group the four-stamened, bilaterally symmetrical Solanaceae into a related group named Salpiglossideae (Bentham 1835) within the subfamily Cestroideae. First thought to be derived from the subfamily Solanoideae, recent work has indicated that the 4-stamened Solanaceae may be more basal and in addition the genera are paraphyletic, leaving “Salpiglossideae” as an artificial group, later placed in a larger sweep of genera, named Subfamily Cestreae (D’Arcy 1978). A new, distinctive species of Browallia was discovered in Arizona (Van Devender & P.Jenkins 1992). Molecular tests indicate this species to be more closely related to a plant that was removed from Browallia by Miers and placed closer to the monotypic genus, Streptosolen than to other Browallia yet morphologically closer to Browallia without a twisted corolla (Olmstead and Palmer 1992). Recent observation of the Mexican-Central American plants called Plowmannia nyctaginoides (Standley) Hunzicker & Subils (personal communication,M. Nee) indicate a morphological alliance between that taxon and Browallia, sensu lato. Tests from morphological studies were used to determine the relationships of Browallia and Plowmania and Streptosolen . The results have biogeographical implications about the age of the group and its distribution.


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1 - University of Arizona, Department of Plant Sciences, Herbarium (ARIZ), Box 210036, Tucson, Arizona, 85721, U.S.A.

Keywords:
Browallia
Solanaceae
Biogeography.

Presentation Type: Oral Paper:Papers for BSA Sections
Session: 66
Location: Maybird/Cliff Lodge - Level C
Date: Wednesday, July 29th, 2009
Time: 1:15 PM
Number: 66002
Abstract ID:767


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