- Riedl, H., Flora Malesiana, ser. I, vol. 13 (Borraginaceae): 65-67 (1997)
- Riedl, H., Flora Malesiana, ser. I, vol. 13 (Borraginaceae): 91-99 (1997)
Synonymous genera:
- Carmona Cav. (1799)
- Cienkowskia Regel & Rach (1867)
- Hilsenbergia Tausch ex Meisn. (1840)
- Lithothamnus Zipp. ex Span. (1841)
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