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Taxonomic Implications of Morphological Variation in Cercis canadensis (Fabaceae) from Mexico and Adjacent Parts of Texas
Department of Animal Ecology, Lund University, Sölvegatan 37, Lund 22362, Sweden .ORCID iD: 0000-0001-7089-524X
2009 (English)In: Systematic Botany, ISSN 0363-6445, E-ISSN 1548-2324, Vol. 34, no 3, 510-520 p.Article in journal (Refereed) Published
Abstract [en]

Taxonomic treatments recognize three varieties of Cercis canadensis: with variety canadensis, widespread throughout the eastern United States, and varieties texensis and mexicana, found east and west of the Pecos River in Texas, respectively. The distribution of Cercis continues southward into northeastern Mexico, but complex variation in leaf shape has confounded straightforward application of varietal names to the Mexican plants. To clarify the taxonomy of Cercis in Mexico, we conducted a morphometric analysis with 281 herbarium specimens, including a representative set of samples from Texas. Correlation and principal component analysis of 12 characters recovered two groups that correspond to the presence versus absence of branchlet pubescence. These groups are geographically distinct at the northern and southern extremes of the focus area but exhibit a large central region of overlap. No other discontinuities in character states were discovered to corroborate this division. Leaf shape varies continuously from ovate-acuminate at the northern and southern extremes to subreniform in the central region, suggesting clinal adaptation to the mesic versus xeric environments in which the plants occur. Based on our data, we apply the varietal epithets mexicana and, provisionally, texensis to Mexican C. canadensis with pubescent and glabrous branchlets, respectively, the latter based on geographic proximity to plants in Texas in the absence of definitive evidence on the phenotypic distinction between varieties canadensis and texensis.

Place, publisher, year, edition, pages
2009. Vol. 34, no 3, 510-520 p.
Keyword [en]
adaptation, cline, elliptic Fourier analysis, morphometrics, redbud, taxonomy
National Category
Ecology Evolutionary Biology Biological Systematics
Identifiers
URN: urn:nbn:se:umu:diva-130371DOI: 10.1600/036364409789271254ISI: 000269770000008Scopus ID: 2-s2.0-70349486035OAI: oai:DiVA.org:umu-130371DiVA: diva2:1066531
Available from: 2017-01-18 Created: 2017-01-18 Last updated: 2017-02-02Bibliographically approved

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CiteExportLink to record
Permanent link

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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
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  • nn-NB
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