Abstract
Barbarea R. Brown consists of about 20 species distributed mainly in Europe and Asia, with the native range of one, B. orthoceras Ledeb., extending from central and eastern Asia into North America. In eastern Asia Barbarea is represented by two native species, B. taiwaniana and B. orthoceras, both of which occur in Taiwan. The taxonomy of the Taiwanese species, however, has been the subject of continuous controversy and there are drastically conflicting views as to their limits. The principal reason behind this persistent controversy is a result of the misinterpretation of the limits of two species, one described by Hayata (1913) as Cardamine arisanensis Hayata and the other by Ohwi (1934) as Barbarea taiwaniana Ohwi, by various authors without the examination of type material. We have critically examined all types cited in this paper, and clarified the confusion in the taxonomy of Taiwanese Barbarea. A detailed description of the genus and its species in Taiwan are provided. A key to the species of Barbarea in Taiwan, synonymies, notes on their distribution with maps, and photographs of representative specimens are presented.
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