Volume 12 of the illustrations series is devoted to 18 plant families, several of which have economic and horticultural importance: Actinidiaceae, source of the kiwi fruit; Balsaminaceae, with the colorful Impatiens genus; Malvaceae, with Gossypium, the genus that provides cotton, and the mallows and hollyhocks; Theaceae, including the tea plant Camellia sinensis, as well as the ornamental camellias; and Vitaceae, notable for Vitis vinifera, the grapevine.