John Forbes Royle (1799-1858) was one of the first to systematically investigate the potential of Indian plants. For economic use that is.
He was superintendant of the botanic garden at Saharanpur from 1823-1831, and succesfully introduces tea. In textile studies his main book is probably "The fibrous plants of India", but in his more general magnum opus on Himalayan flora, he also adds interesting details on dye stuffs.
more to follow..