A Taxonomic Study of Goodyera R. Br. (Orchidaceae) in Taiwan

• Main Authors: Chung Shih Wen, 鐘詩文
• Other Authors: Chern-Hsiung Ou
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/36436068284089826961

博士 === 國立中興大學 === 森林學系所 === 96 === The taxonomical revision of the genus Goodyera, Orchidaceae, in Taiwan was made based on morphological, cytotaxonomic, and molecular phylogenetic studies. The members of this genus are morphologically diverse. Characters on leaves, sepals, petals, column and pollinaria, as well as habitat, are essential for intrageneric grouping. The results obtained from study on the cytotaxonomy showed that aneuploidization and polyploidization exist in this genus, and they may play important roles on speciation in Goodyera. Based on cytotaxonomy, the Goodyera species in Taiwan can be divided into three groups. Mitotic chromosome numbers of these twenty species in Taiwan were observed in this research. The chromosome numbers for each group are 2n=22 or 42, 2n=30 or 60, and 2n=28 or 56 accordingly. Among these species, eight species were presented with the first study on cytotaxonomy. Molecular phylogeny showed that Goodyera in Taiwan was monophyletic and the taxa in Taiwan formed six clades. The studies on morphology, cytotaxonomy, and molecular systematics are highly congruent to each other, and the new classification was made accordingly. The genus was divided into three sections: section Goodyera with chromosome numbers 2n=30 or 60, section Reticula Chung & Ou with chromosome numbers 2n=28 or 56, and section Otosepalum Schlechter with chromosome numbers 2n=22 or 42. Twenty species were identified in Taiwan. Goodyera arisanensis, G. pendula, G. maximowicziana, G. yamiana and G. yangmeshanensis are synonymized under of G. nantoensis, G. recurva, G. bifida, G. boninensis and G. pusilla respectively. Goodyera viridiflora was mis-applied name correct name is G. carnea. Goodyera bomiensis was a new addition to the Flora of Taiwan.