This book, Medicinal and Aromatic Plants IX, like the previous eight volumes published in 1988, 1989, 1991, 1993, 1994, and 1995, is unique in its approach. It comprises twenty-four chapters dealing with the distribution, importance, conventional propagation, micropropagation, tissue culture studies, and the in vitro production of important medicinal and pharmaceutical compounds in various species of Agave, Anthemis, Aralia, Blackstonia, Catha, Catharanthus, Cephalocereus, Clerodendron, Coronilla, Gloeophyllum, Liquidambar, Marchantia, Mentha, Onosma, Paeonia, Parthenium, Petunia, Phyllanthus, Populus, Portulaca, Sandersonia, Serratula, Scoparia, and Thapsia. It is tailored to the needs of advanced students, teachers, and research scientists in the field of pharmacy, plant tissue culture, phyhemistry, biochemical engineering, and plant biotechnology in general.