Abstract
BackgroundAn unknown Sedum was found from the limestone region in Taiwan. After a detailed comparison with other congeners in Taiwan and neighboring countries, we identified this plant as a new species.ResultsThis new taxon resembles S. nokoense Yamamoto, S. alfredii Hance, and S. uniflorum Hook. & Arn. subsp. oryzifolium (Makino) H. Ohba, but differs in leaf shape, sepal morphology, and seed testa micro-morphology. Ecologically, this new taxon occurs exclusively on limestone, while S. nokoense and S. alfredii grow in non-limestone areas and S. uniflorum subsp. oryzifolium is only found on sandy seashores.ConclusionsSedum tarokoense H.W. Lin & J.C. Wang is described as a new species. We provide a description, line drawing, and distribution map, as well as photograph, a key and a table to distinguish S. tarokoense from its related species.Electronic supplementary materialThe online version of this article (doi:10.1186/1999-3110-54-57) contains supplementary material, which is available to authorized users.
Highlights
An unknown Sedum was found from the limestone region in Taiwan
Sedum is cosmopolitan in distribution and mainly inhabits semiarid and mountainous regions
Section Sedum can be separated from sections Oeades and Filipes by adaxially gibbous carpels and follicles while sect
Summary
An unknown Sedum was found from the limestone region in Taiwan. After a detailed comparison with other congeners in Taiwan and neighboring countries, we identified this plant as a new species. Sedum L., the largest genus of Crassulaceae, consists of approximately 470 species of predominantly succulent plants. Sedum is cosmopolitan in distribution and mainly inhabits semiarid and mountainous regions. According to the Flora of China, the genus can be divided into three sections (Fu and Ohba 2001). Section Sedum can be separated from sections Oeades and Filipes by adaxially gibbous carpels and follicles while sect. Filipes by having a spurred (vs spurless) leaf base and petals that are mainly yellow (vs white)
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