First published in J. Jap. Bot. 45: 340 (1970)
- Govaerts, R. (2003). World Checklist of Selected Plant Families Database in ACCESS: 1-216203. The Board of Trustees of the Royal Botanic Gardens, Kew.
Not accepted by
- Ridsdale, C.E. (2008). Thorny problems in the Rubiaceae: Benkara, Fagerlindia and Oxyceros. Reinwardtia 12: 289-300. [Cited as Benkara rectispina.]
Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2022. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
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