Leaves narrower, oblong, pointed at the apex. Described from specimens collected by Ludlow and Sherriff in S.E. Tibet in 1936, and introduced by them. The type is from the Bimbi La, in Tsari. In the field note they remark: ‘Indumentum of dried leaf is skinned off and rolled up and sold as wicks for butter lamps’ – whence the epithet luciferum.