References
- Haberlandt . 1914 . Physiological Plant Anatomy 607 English translation
- Harvey-Gibson and Horsman . 1919 . Anatomy of Berberidaceae . Trans. Roy. Soc. Edin. , lii ( iii ) : 501
- Réaubourg . 1906 . Les Holboellia de la Chine centrale . Bull. Soc. Bot. France , liii : 451
- Rehder and Wilson . 1913 . Plantae Wilsonianae Vol. i , 350