External links to taxonomic opinions:
- IPNI Life Sciences Identifier (LSID)
- urn:lsid:ipni.org:names:77178303-1
- Publication
- Illustrated Dictionary of Gardening, a Practical and Scientific Encyclopaedia of Horticulture for Gardeners and Botanists. Edited by George Nicholson. London
- Collation
- 3: 8
- Family as entered in IPNI
- Rubiaceae