Research Paper

Scleromitrion sirayanum (Rubiaceae: Spermacoceae), a new species of the Hedyotis-Oldenlandia complex in Taiwan

Tian-Chuan Hsu and Zhi-Hao Chen

Published on: 28 April 2017

DOI: 10.6165/tai.2017.62.151

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2017 vol.62 no.2 pp.151-156


The new species Scleromitrion sirayanum T.C. Hsu & Z.H. Chen (Rubiaceae) is described and illustrated from Taiwan. S. sirayanum is similar to S. angustifolium (Cham. & Schltdl.) Benth. but easily distinguished by its constantly solitary flowers, salverform corolla, adaxially basally long villous corolla lobes, spreading to ascending persistent calyx lobes, and obconic capsules dehiscent both septicidally and loculicidally into 4 valves. S. sirayanum is so far only found in Nanhua District of Tainan City and evaluated as Vulnerable based on the IUCN Red List criteria. Three new combinations are also proposed for the Hedyotis-Oldenlandia complex in Taiwan.

Keyword: Hedyotis-Oldenlandia complex, New species, Rubiaceae, Scleromitrion sirayanun, Taiwan, Taxonomy