Buddleja crispa

Buddleja crispa, the Himalayan butterfly bush, is a deciduous shrub native to Iran, Afghanistan, Bhutan, North India, Nepal, Pakistan and China (Yunnan, Sichuan, Tibetan Autonomous Region and north to Gansu), where it grows on dry river beds, slopes with boulders, exposed cliffs, and in thickets, at altitudes of 1400–4300 m. Named by Bentham in 1835, B. crispa was introduced to cultivation in 1850, and came to be considered one of the more attractive species within the genus. In 1961, it was accorded the Royal Horticultural Society's Award of Merit, and in 1997 it ranked 8th out of 57 species and cultivars in a public poll arranged by the Center for Applied Nursery Research (CANR) at the University of Georgia, US. However, the species is not entirely cold-hardy, and thus its popularity is not as ubiquitous as it might otherwise be....read more on Wikipedia.