Synopsis The first and the second volumes of the Red Data Book on Indian plants were published by the Botanical Survey of India in the years 1987 and 1988 and include 619 data sheets. The present volume deals with 195 threatened taxa of Indian flora. As in the Vols. 1 & 2, a number of line drawings (placed nearest to corresponding data sheets) and eight colour plates have been included here. Of these, data sheets on Cymbidium tigrinum Vol. 2, p. 168), Cymbidium hookerianum (Vol. 1, p. 241)and Paphiopedilum Villosum (Vol. 1, p. 272) have already appeared. A combined index to the species dealt in the three volumes published so far is presented at the end.