Disporum nanchuanense (Colchicaceae), a new species from Chongqing, China

Abstract

Disporum nanchuanense (Colchicaceae), a new species from Jinfo Mountain National Nature Reserve, Nanchuan District, Chongqing, China, is described and illustrated. It is similar to D. longistylum and D. megalanthum, but differs from the former in its stem branched type, tepals colour and size, stamens and pistil size; and it differs from the latter in inflorescence position, tepals shape, stamens position, pistil position and size. Meanwhile, the new taxon is assessed as Vulnerable (VU D2), according to the IUCN Red List criteria. Furthermore, an identification key to all Chinese species of Disporum is provided.

Micromorphological differentiation of Korean Disporum species using light and scanning electron microscopy

“…In general, tepal micromorphological characters in angiosperms are associated with plant‐pollinator interaction (Costa, Pimentel, Chagas, Alves, & Castro, 2017; Piwowarczyk & Kasińska, 2017), and could be useful for taxonomic identification in various groups (Barone Lumaga et al, 2012; Jang et al, 2014; Park et al, 2020). Although floral micromorphological characteristics have not been commonly assessed in taxonomic studies of the genus Disporum (Chen et al, 2000; Hu et al, 2016; Li et al, 2007; Zhu et al, 2016, 2019), we confirmed that the micromorphology of gynoecium such as stigma, style, ovary epidermal cell surfaces were useful for the identification for the four Korean Disporum species as reported in other plant groups of Liliaceae s.l . (Chimona et al, 2018; Roguz et al, 2018; Stolar & Davis, 2010).…”

“…The micromorphological features observed using light and scanning electron microscopic (LM and SEM) analyses revealed taxonomically relevant characters for the identification of Korean Disporum species. Despite numerous recent discoveries of new species in the genus Disporum (Hareesh, Floden, & Sabu, 2018; Hu et al, 2016; Li et al, 2007; Zhu et al, 2016; Zhu et al, 2019), micromorphology has only been described in a limited number of taxa, and orbicular characteristics have never been studied in detail in Korean species (Lee, 1979; Lee & Yeau, 1990). The present study provides the first comprehensive description of orbicular, leaf and floral epidermal, and pollen micromorphology in Korean Disporum .…”

“…Disporum and Paradisporum ) based on external morphological characters (e.g., presence of stolons, tepal color and shape and trichome type on the filaments and styles; Chen et al, 2000), karyological studies (Tamura, Utech, & Kawano, 1992), and molecular phylogenetic data (Shinwari et al, 1994, 1994b; Shinwari, Terauchi, & Kawano, 1994; Tamura, Yamada, Fuse, & Hotta, 2013). The center of species diversity for the genus is in China, where 18 species occur, of which 12 species are endemic with a number of species recently described (Chen et al, 2000; Hu, Xu, & Huang, 2016; Li, Zhang, & Hong, 2007; Zhu, Liao, & Yi, 2019; Zhu, Zhang, Shen, Liu, & Zhang, 2016). In Korea, four species from Disproum section Disporum are currently recognized: D. sessile D. Don, D. smilacinum A.…”

A Note on Disporum cantoniense (Lour.) Merr., Collected from Bonai Forest Division, Odisha, India

“…belonging to the family Colchicaceae. Disporum Salisb., (1812) represented by 24 species distributed in Bhutan, China, India, Japan, Korea, Laos, Malaysia, Myanmar, Nepal, Russia, Sikkim, Thailand, and Vietnam [1]. Among these, more than 14 species have been found in China with 8 endemic species, 4 species are recorded in Japan and 4 species are recorded in Taiwan [2].…”