The varieties of Bauhinia pottsii G. Don in Thailand (Leguminosae-Caesalpinioideae) |
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Authors: | T Boonkerd S Saengmanee B R Baum |
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Institution: | (1) Department of Botany, Faculty of Science, Chulalongkorn University, Bangkok, Thailand, TH;(2) Eastern Cereal and Oilseed Research Centre, Ottawa, Ontario, Canada, CA |
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Abstract: | Bauhinia pottsii G. Don, B. subsessilis Craib, B. velutina (Wall. ex Benth.) Baker, B. mollissima (Wall.) Prain, and B. decipiens Craib were recently recognized as five varieties of Bauhinia pottsii G. Don. They grow naturally in southern Myanmar, Thailand, Indochina and the Malay Peninsula. Bauhinia pottsii var. decipiens (Craib) K. Larsen & S. S. Larsen is endemic to Thailand and known only from the type collection, so it was omitted from this
study. Quantitative and qualitative morphological characters were examined in 200 specimens using multivariate and univariate
analyses to determine the taxonomic relationship among the four. Some variation in qualitative characters was found between
the varieties which separated them as previously defined in Flora of Thailand. Forty-three quantitative characters were subjected
to cluster analysis to allow an objective classification into groups. The groups were subsequently evaluated by a canonical
discriminant analysis. It was found that these characters collectively support the four varieties as defined by qualitative
characters. However, the close relationship of varieties mollissima (Wall. ex Prain) K. Larsen & S. S. Larsen and velutina (Wall. ex Benth.) K. Larsen & S. S. Larsen is observed. The linear discriminant function has an overall rate of 98.5% correct
classification and is useful for variety classification. Among quantitative characters, petal-claw length and ovarystalk length
together with some qualitative characters are useful for key construction to separate the four varieties.
Received April 24, 2001 Accepted December 11, 2001 |
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Keywords: | : Bauhinia pottsii multivariate analysis canonical discriminant analysis cluster analysis |
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