The principal plants in this order that are interesting to amateurs, are included in the genera Lythrum, Cuphea, Heimia, Lawsonia, and Lagerstrœmia. The genus Lythrum contains all those showy British plants which are called the Willow Herbs. The flowers are purple, and the petals, which are four or six in number, are crumpled in the bud. The stamens are either the same number as the petals, or twice the number, and the capsule is two-celled. The calyx, as in all the plants included in this order, is tubular, with numerous lobes; and the petals soon fall off. Cuphea is a genus principally of annual plants, with six or seven dark purple petals, unequal in size, and curiously inserted in the calyx. Heimia is a genus of South American shrubs, with yellow flowers. Lawsonia inermis produces the Henna, which the ladies of the East use to dye the palms of their hands pink; and Lagerstrœmia is a beautiful conservatory tree, with handsome flowers. This plant is sometimes called the pride of India. ORDER LXXX.—TAMARISCINEÆ.—THE TAMARISK TRIBE. There are very few plants in this order, and the only ones common in British gardens are the French Tamarisk (_Tamarix Gallica_), and the German Tamarisk (_Tamarix_, or _Myriacaria Germanica_); both of which are easily recognized by their light airy branches, (which when young are covered with closely imbricated leaves, though the leaves drop off as the wood ripens,) and their terminal erect spikes of whitish or pink flowers. The seeds are large, and are each furnished with a tuft of hairs at the end of a kind of stalk. These plants are very suitable for planting near the sea, as they are uninjured by the sea-breeze. ORDER LXXXI.—MELASTOMACEÆ. This order consists of showy exotic plants, most of which require a stove in Britain, and which are easily known by their leaves being marked with two or more deep lines running parallel to the midrib. They are all free-growing plants, with very handsome flowers, which are generally purple or white. ORDER LXXXII.—ALANGIEÆ. There are two genera, Alangium and Marlea, both handsome shrubs, natives of India. ORDER LXXXIII.—PHILADELPHEÆ.—THE MOCK-ORANGE TRIBE.