Flora indica: Being a systematic account of the plants of British India, together with observations on the structure and affinities of their natural orders and genera. Vol. 1. Ranunculaceae to Fumariaceae, with an Introductory Essay. All published.

Digital facsimile from Biodiversity Heritage Library at this link. The Introductory Essay was also published separately by W. Pamphlin in 1855 with the following title: Introductory essay to the Flora Indica: including preliminary observations on the study of Indian botany; a summary of the labor of Indian botanists; a sketch of the meteorology of India; outlines of the physical geography and botany of the provinces of India. Digital facsimile of the separate edition of the Introductory Essay  from darwin-online.org at this link.