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Morphometric studies of polyploid Cardamine species (Brassicaceae) from Japan: solving a long-standing taxonomic and nomenclatural controversy

Morphometric studies of polyploid Cardamine species (Brassicaceae) from Japan: solving a... Polyploidy is an important evolutionary mechanism and speciation mode in plants; however, delimitation of species boundaries in polyploid complexes is often a difficult task. In the present paper, we explore morphological variation in a group of East Asian Cardamine polyploids that have long been shrouded in taxonomic and nomenclatural confusion. We relate the present morphometric data of 41 sampled populations with recently published ploidy-level data, and propose a revised taxonomic treatment, including the designation of several lectotypes. The following species are recognised in Japan: C. schinziana O.E.Schulz (2 n = 6 x , 8 x ), C. torrentis Nakai (2 n = 8 x ), C. valida (Takeda) Nakai (2 n = 4 x ) and C. yezoensis Maxim. (2 n = 6 x −12 x ). C. amariformis Nakai (2 n = 4 x ) from Korea is also discussed, although it may be conspecific with C. valida , pending further studies. Distribution of these taxa in the Japanese Archipelago is characterised, including comments on their occurrence outside of Japan. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Australian Systematic Botany CSIRO Publishing

Morphometric studies of polyploid Cardamine species (Brassicaceae) from Japan: solving a long-standing taxonomic and nomenclatural controversy

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References (60)

Publisher
CSIRO Publishing
Copyright
CSIRO
ISSN
1030-1887
eISSN
1446-4701
DOI
10.1071/SB09038
Publisher site
See Article on Publisher Site

Abstract

Polyploidy is an important evolutionary mechanism and speciation mode in plants; however, delimitation of species boundaries in polyploid complexes is often a difficult task. In the present paper, we explore morphological variation in a group of East Asian Cardamine polyploids that have long been shrouded in taxonomic and nomenclatural confusion. We relate the present morphometric data of 41 sampled populations with recently published ploidy-level data, and propose a revised taxonomic treatment, including the designation of several lectotypes. The following species are recognised in Japan: C. schinziana O.E.Schulz (2 n = 6 x , 8 x ), C. torrentis Nakai (2 n = 8 x ), C. valida (Takeda) Nakai (2 n = 4 x ) and C. yezoensis Maxim. (2 n = 6 x −12 x ). C. amariformis Nakai (2 n = 4 x ) from Korea is also discussed, although it may be conspecific with C. valida , pending further studies. Distribution of these taxa in the Japanese Archipelago is characterised, including comments on their occurrence outside of Japan.

Journal

Australian Systematic Botany – CSIRO Publishing

Published: May 31, 2010

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