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|Classification System: APG IV|
- Howellia A.Gray, Proc. Amer. Acad. Arts 15: 43 (1880)
- Gray, A. (1880) Proceedings of the American Academy of Arts and Sciences 15(1): 43–44.
- Govaerts, R. et al. 2014. Howellia in World Checklist of Selected Plant Families. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the internet. Accessed: 2014 July 15.
- Tropicos.org 2014. Howellia . Missouri Botanical Garden. Published on the internet. Accessed: 2014 July 15.
- International Plant Names Index. 2014. Howellia. Published online. Accessed July 15 2014.
|For more multimedia, look at Howellia on Wikimedia Commons.|