External links to taxonomic opinions:
- IPNI Life Sciences Identifier (LSID)
- urn:lsid:ipni.org:names:25405-1
- Publication
- North American Flora. New York Botanical Garden
- Collation
- 32(1): 24
- Date of Publication
- 28 Dec 1918
- Family as entered in IPNI
- Rubiaceae