Primulina cardaminifolia (Gesneriaceae), a Rare New Species from Limestone Areas in Guangxi, China

Wei-Bin Xu ； Yan Liu ； Yoshiko Kono ； Hsuan Chang ； Ching-I Peng ； Kuo-Fang Chung

《Botanical Studies》 54卷8月 (2013/08) Pp. 152-160

https://doi.org/10.1186/1999-3110-54-19

並列摘要

Background: Primulina cardaminifolia Yan Liu & W.B. Xu (Gesneriaceae), a distinct new species with imparipinnate leaves, is described and illustrated from a limestone valley in Guangxi Zhuangzu Autonomous Region, China. To assure its generic placement and phylogenetic affinity, phylogenetic analyses were performed using DNA sequences of nuclear ITS and chloroplast trnL-F intron spacer region. Additionally, somatic chromosome number was counted and pollen stainability was tested.Results: Phylogenetic analyses support its placement in Primulina; however, two phylogenetically distinct ITS sequence types were detected, suggesting a probable hybrid origin. Its pollen stainability is 100% and its chromosome number, 2n=36, is congruent with all known counts of diploid species of the genus.Conclusion: All available data support the recognition of the new species Primulina cardaminifolia and suggest that it could have derived from homoploid hybrid speciation. Color plates, line drawings and a distribution map are provided to aid in identification.

並列關鍵字

Chromosome number ； Flora of China ； Homoploid hybrid ； Sino-Vietnamese limestone karst ； Molecular taxonomy ； Primulina pinnata