Buddleja colvilei is endemic to the eastern Himalaya. Discovered by Hooker

Joseph Dalton Hooker

Sir Joseph Dalton Hooker OM, GCSI, CB, MD, FRS was one of the greatest British botanists and explorers of the 19th century. Hooker was a founder of geographical botany, and Charles Darwin's closest friend...

 in 1849, he described it as 'the handsomest of all Himalayan shrubs'

Description

B. colvilei is a deciduous

Deciduous

Deciduous means "falling off at maturity" or "tending to fall off", and is typically used in reference to trees or shrubs that lose their leaves seasonally, and to the shedding of other plant structures such as petals after flowering or fruit when ripe...

 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 > 8cm wide, rose or crimson, but white within the corolla. 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 .

Cultivation

The shrub is not entirely hardy in the UK, and can only be reliably grown outdoors along the Atlantic coast

Atlantic Coast

The Atlantic Coast is any coast fronting the Atlantic Ocean. The term differentiates the coasts of countries or continents with coastlines on more than one body of water, such as North America, South America, Africa and Europe.-See also:*Indian Ocean...

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Suppliers

UK nurseries stocking the plant can be found in the RHS Plantfinder
http://apps.rhs.org.uk/rhsplantfinder/plantfinder2.asp?crit=buddleja&Genus=Buddleja.