Crassulaceae CRASSULA (South Africa), Plants tree-like, rosette-forming, clambering and spreading, their habit and form being their chief attraction. Fl. usually white. SP. GH. 1С. Fairly dry in winter. FW in growing season. 45°F(7.5°C) or slightly higher for some. Propagation from seeds or cuttings-of easy cultivation. C. argentea (tree-like), C. lycopodioides (like club-moss), C. perforata (leaves chain-like), C. teres (leaves in close-set miniature columns). Over 200 species and varieties. ECHEVERIA (Mexico, U.S.A.). Rosette plants of foliage attraction, interesting, unusual and often colourful Fl. Easy cultivation. Propagated by stem or leaf cuttings. GH. 1С. SP. FW-restrict in winter. 45°C(7.5°C). E. agavoides, E. nodulosa, E. potosina are representative of weil over 100 species and varieties. Other easily grown, fascinating genera within this family include Kalan-choe, Sedum, Aeonium, Monanthes, representing several hundreds of species. Euphorbiaceae EUPHORBIA (including Africa, Arabia). A vast family of cactus-like, shrubby, globular or other peculiarly-shaped plants. Propagation from seeds or cuttings. GH. 1С (few). SP. Extreme care with watering. 50°F(io°C) or more. E. abyssinica (cactus-like), E. bupleurifolia (caudex with apical leaves), E. oncoclada (spineless, slender cylindrical stem, shrubby), E. milii (leafy-shrub, crown of thorns), E. xylophylloides (grey-green, flattened stems). One of the largest plant families, many hundreds of species. Asclepiadaceae Includes hundreds of species within the genera Stapelia, Duvalia, Huernia, Hoya, Stultitia and 30 others. Many species such as Stapelia variegata, Hoya carnosa and Ceropegia woodii are well-known in collections. The majority may be grown readily from seeds or cuttings. GL. GH. 1С (few). Careful watering at all times. Open compost. In general, not beginners' plants. Mesembryanthemaceae Plants native to arid areas of Africa, Arabia, America and elsewhere, and includes about 120 genera and thousands of species. Many shrubby plants are included in genera such as Lampranthus, Ruschia and Delosperma. Most fascinating are the mimicry plants Lithops, Conophytum, Gibbaeum, Nanan-thus, Pleiospilos and kindred genera. These, as a group, are "specialist" plants and reference should be made to authoritative works on the subject. Most species can be grown successfully from seeds or offsets. Flowers are colourful and are readily produced in a bright sunny position. GH. 1С (few). RS varies according to species, but mainly in the months from November to April-then keep completely dry. Moderate watering in growing season. 50°F(io°C) generally. While the principal succulent plant families have been mentioned, many have, of necessity, been omitted. A great deal of information can be gathered by reference to authoritative books. Books of reference include Cactus Lexicon, by Curt Backeberg, published by Blandford, a comprehensive record of the Cactaceae, and Lexicon of Succulent Plants, by Hermann Jacobsen, published by Blandford, a complete reference book on other succulents.