Sir Joseph Dalton Hooker, Thomas Thomson (1855). “Introductory essay to the Flora Indica: including preliminary observations on the study of Indian botany; a summary of the labours of Indian botanists; a sketch of the meteorology of India; outlines of the physical geography and botany of the provinces of India: With 2 Maps. By J. D. Hooker and Thomas Thomson. Reprinted from the "Flora Indica"”, p.41