New Leaf Classification of Mahonia (Berberidaceae)

doi:10.11983/CBB24149

Abstract

Abstract: Mahonia (Berberidaceae) is a genus exemplifying a classic East Asia-Western North America (EA/WNA) disjunction, with extensive fossil leaf records in Cenozoic strata in the Northern Hemisphere. The combined characteristics of leaf architecture of Mahonia is obvoiusly distinguishable from those of other angiosperm taxa, making it a invaluable biological proxy or model plant for investigating the formation processes underlying the intercontinental discontinuity between East Asia and North America. Traditionally, taxonomists have classified the genus into two groups based on venation patterns: Group Orientales with palmate venation and Group Occidentales with pinnate venation. Here, on the basis of previous research, we refine this classification by identifying 7 leaf types within Group Orientales (Microphylla type, Japonica type, Cardiophylla type, Bodinieri type, Polyodonta type, Fortunei type, and Nervosa type) and 6 leaf types in Group Occidentales (Chochoco type, Dictyota type, Volcania type, Pumila type, Lanceolata type, and Aquifolium type), based on detailed leaf architecture characters. This newly established leaf architecture classification of Mahonia has a great potential for tracing its morphological evolution and biogeographic history.

Key words: Mahonia, leaf architecture, classification, morphylogical evolution, East Asia-Western North America disjunction

Bailong Zhao, Yeliang Li, Yufei Wang, Bin Sun. New Leaf Classification of Mahonia (Berberidaceae)[J]. Chinese Bulletin of Botany, DOI: 10.11983/CBB24149.

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URL: https://www.chinbullbotany.com/EN/10.11983/CBB24149

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