Plant Diversity ›› 2014, Vol. 36 ›› Issue (05): 561-568.doi: 10.7677/ynzwyj201413237

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Cytology of Thirteen Taxa in the Genus Isodon (Lamiaceae: Nepetoideae) from China

XIANG Chun-Lei-1, CHEN Ya-Ping-1、2, Tsuneo FUNAMOTO-3, PENG Hua-1   

  1. 1 Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China; 2 University of Chinese Academy of Sciences, Beijing 100049, China; 3 Biological Institute, Fundamental Education and Research Center of Pharmaceutical Sciences, Showa Pharmaceutical University, 1948543 Tokyo, Japan
  • Received:2013-12-12 Online:2014-09-25 Published:2014-04-24
  • Supported by:

    Knowledge Innovation Project of the Chinese Academy of Sciences (KSCX2EWJ24, KSCX2EWZ1), National Natural Science Foundation of China (31270245, 31110103911), and State Key Laboratory of Systematics and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences (LSEB201208)

Abstract:

This paper reports the chromosome numbers of 11 species and two varieties of Isodon from 16 populations in China. For all taxa except Ilophanthoides var. graciliflorus, chromosome numbers are reported here for the first time. All taxa are counted as diploid (2n=24): Ialbopilosus, Icoetsa, Iflabelliformis, Iforrestii, Igesneroides, Ilophanthoides var. graciliflorus, Ioreophilus var. elongatus, Iparvifolius, Ipleiophyllus, Ipolystachys, Iracemosus, Iscoparius, and Iweisiensis. Thus, x=12 is inferred as the basic chromosome number of Isodon. In addition, the chromosome number 2n=48, which is newly recorded for the genus, is also reported in one population of Icoetsa, indicating the species to be diploid and tetraploid.

Key words: Chromosome number, Hengduan Mountains, Isodon, Polyploidy

CLC Number: 

  • Q 942