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(American Journal of Botany. 2005;92:525-533.)
© 2005 Botanical Society of America, Inc.

Systematics

Hybrid origin of "Bauhinia blakeana" (Leguminosae: Caesalpinioideae), inferred using morphological, reproductive, and molecular data1

Carol P. Y. Lau, Lawrence Ramsden and Richard M. K. Saunders2

Department of Ecology & Biodiversity, The University of Hong Kong, Pokfulam Road, Hong Kong, China

Bauhinia blakeana (Leguminosae subfam. Caesalpinioideae tribe Cercideae), or the Hong Kong Orchid Tree, is of great horticultural value. It is completely sterile and is shown here to be the result of hybridization between the largely sympatric species, B. purpurea and B. variegata. Although the analysis of patterns of morphological variation revealed only a few examples of phenotypic intermediacy, study of intersimple sequence repeat (ISSR) markers enabled unequivocal identification of the parental species due to the presence of additive inheritance of alleles and the absence of any bands that are unique to B. blakeana. Investigation of aspects of the reproductive biology of the taxa furthermore revealed that the parental species are largely xenogamous, have flowering periods that overlap seasonally and temporally, and share common pollinators. Evidence is provided to show that B. blakeana is not naturally stabilized and is only maintained horticulturally by artificial propagation. It is therefore recommended that the hybrid be regarded as a horticultural cultivar rather than a naturally occurring species; a new cultivar name, Bauhinia ‘Blakeana’, is accordingly validated.

Key Words: Bauhinia blakeana • Bauhinia purpurea • Bauhinia variegata • cultivar • Hong Kong • hybridization • ISSR • pollination






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