Calamus beccarii is described from Taiwan. It is compared with the two other species of Calamus from Taiwan, C. formosanus and C. siphonospathus, and distinguished from them by its presence of a flagellum and absence of a cirrus.
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Jung, M. J. (2016). 四葉多莢草(石竹科),台灣北部新馴化植物. 臺灣林業科學, 31(1), 69-73. https://www.airitilibrary.com/Article/Detail?DocID=10264469-201603-201604060031-201604060031-69-73