Buddleja davidii var. superba is endemic to the Yunnan province of western China.Stuart, D. D. (2006). Buddlejas. RHS Plant Collector Guide. Timber Press, Oregon. The taxonomy of the plant and the other five davidii varieties has been challenged in recent years. Leeuwenberg sank them all as synonyms, considering them to be within the natural variation of a species,Leeuwenberg, A.J.M. (1979). The Loganiaceae of Africa XVIII Buddleja L. II. Revision of the African and Asiatic species. Mededelingen Landbouwhogeschool Wageningen, Nederland a treatment adopted in the Flora of China published in 1996,Li, P-T. & Leeuwenberg, A. J. M. (1996). Loganiaceae, in Wu, Z. & Raven, P. (eds) Flora of China, Vol. 15, p. 335. Science Press, Beijing, and Missouri Botanical Garden Press, St. Louis, USA. online at www.efloras.org and also upheld by both the Plants of the World Online database and the International Dendrology Society's Trees and Shrubs Online website.
Description Buddleja davidii var. superba is chiefly distinguished by the size of its fragrant, violet-purple panicles, which are more than double the length of those of the type, and even longer than those of var. magnifica. The plant is otherwise like the type.
Cultivation Buddleja davidii var. superba is not known to remain in cultivation.
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