This classical work on the Cactaceae, out of print for many years, has been reissued by Dover in two hard-cover volumes. Practically all of the material in the original 4-volume work has been reproduced. Descriptions are provided for 124 genera and 1253 species. Over 1200 photographs, line drawings, and sketches are used to show flowers, spines, overall shapes, growth, fruit, flowering specimens under cultivation or in natural habitat, and special features, all of which are very helpful in making identifications in this difficult group.