This is a revised edition of a standard text which has been enhanced by additional material, eight new entries, twenty-eight new illustrations, extended taxonomic documentation for each entry, and an expanded reference list. A general introduction discusses the description and classification of weeds, distinguishes between poisonous and useful varieties, and describes recent developments in weed research and control. The book mainly concentrates in detail on 170 species of vascular plants. Each entry gives the scientific name of the plant, with a brief taxonomic history; Arabic and English names where available; a botanical description; and notes on habitat, worldwide distribution, and uses. A full-page line illustration accompanies each entry. There is a complete reference list, and the book contains three indexes of scientific, English, and Arabic names.