The hardy plants belonging to this order, that are well known in Britain, were formerly included in the genus Anona; but now the only species retained in that genus are stove plants, natives of the West Indies, with yellowish brown or dark purple flowers, the calyx of which is in three sepals, and the corolla in three or six thick fleshy petals, and which have numerous stamens with large angular anthers, and very short filaments. The carpels are numerous, but they grow altogether into a fleshy eatable fruit, divided into many cells, each containing one seed. This fruit is called the custard apple or sour sop in the West Indies; and it differs in flavour in the different species, but the most delicious kind is produced by _A. Cherimolia_, a native of Peru. The hardy species included in Anona by Linnæus have been separated from that genus, and formed into another under the name of _Asimina_, the principal distinction between them being in the fruit; which in the genus Asimina consists of two or three berry-like carpels growing together, not eatable, and each containing many seeds. _A. triloba_, the hardiest species, is a large shrub, with dark brownish purple flowers. The plants in this order are all aromatic. ORDER V.—MENISPERMACEÆ.—THE COCCULUS TRIBE. All the plants contained in this order are climbing exotic shrubs, generally with drooping racemes of small delicate flowers, the male and female flowers being on different plants. The number of sepals and petals varies in the different genera, and sometimes the petals are wanting. The stamens frequently grow together into a central column; and the fruit is a drupe or one-seeded berry, generally scarlet, but sometimes black. The principal plants in this order which are known in England, are, _Menispermum canadensis_ (the Canadian Moon Seed), a very ornamental hardy, climbing, shrub; _Cocculus palmatus_, the root of which is a tonic drug, called Columba root; _Anamirta Cocculus_, which produces the berries called _Cocculus indicus_ in the shops, which are said to be used in porter to give it an intoxicating property; _Schizandra coccinea_, a greenhouse climber with scarlet flowers; and _Kadsura japonica_, a climbing shrub with white flowers and red berries, which proves quite hardy in the open air. _Kadsura_, _Schizandra_, and three other genera, little known in this country, have been formed into a new order under the name of Schizandriaceæ. The qualities of all these plants are tonic. ORDER VI. BERBERIDEÆ.—THE BERBERRY TRIBE. [Illustration: FIG. 107.—DETAILS OF THE FLOWER AND FRUIT OF THE COMMON BERBERRY, PARTLY MAGNIFIED.]