Buddleja colvilei is endemic to the eastern Himalaya; discovered by Hooker in 1849, he declared it 'the handsomest of all Himalayan shrubs'  The species was awarded the RHS First Class Certificate (FCC) in 1896. 
B. colvilei is a deciduous large shrub or small tree which can grow > 13 m, often single stemmed. The flowers are arranged in drooping panicles, 15–20 cm long by > 8 cm wide, rose pink to crimson, but often white within the corolla tube. The flowers are among the largest of any in the genus, and appear in June. The leaves are < 25 cm long, narrow, shallowly - toothed, and tapered at either end. This species has a high degree of polyploidy with a correspondingly high chromosome number of 2n = 152–456 (8x–24x).
- Buddleja colvilei 'Kewensis', distinguished by its dark red flowers.
- Bean, W. J. (1914). Trees and shrubs hardy in the British Isles. 7th Ed. 1950, Vol. 1, p. 320.
- Hillier & Sons. (1990). Hillier's Manual of Trees & Shrubs, 5th ed.. p. 47. David & Charles, Newton Abbot. ISBN 0-7153-67447
- Chen, G, Sun, W-B, & Sun, H. (2007). Ploidy variation in Buddleja L. (Buddlejaceae) in the Sino - Himalayan region and its biogeographical implications. Botanical Journal of the Linnean Society. 2007, 154, 305 – 312. The Linnean Society of London.
- Stuart, D. D. (2006). Buddlejas. RHS Plant Guide. Timber Press, Oregon. ISBN 978-0-88192-688-0
- Leeuwenberg, A. J. M. (1979) The Loganiaceae of Africa XVIII Buddleja L. II, Revision of the African & Asiatic species. H. Veenman & Zonen, Wageningen, Nederland.
- Phillips, R. & Rix, M. (1989). Shrubs, Pan Books, London.
- Li, P. T. & Leeuwenberg, A. J. M. (1996). Loganiaceae, in Wu, Z. & Raven, P. (eds) Flora of China, Vol. 15. Science Press, Beijing, and Missouri Botanical Garden Press, St. Louis, USA. ISBN 978-0915279371 online at www.efloras.org
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