There are only two genera in this order, both of which are remarkable for the fragrance of their flowers. The American Allspice (_Calycanthus floridus_) is a shrub, with very dark blackish purple flowers, which botanists consider to be all calyx, the plants in this order having no petals. The lobes of the calyx are somewhat leathery in texture, and lanceolate in form; they are very numerous, and they are disposed in several rows, like scales. The stamens are numerous, but only the outer twelve are fertile, and they soon fall off. The peduncle is thickened below the flower; and the receptacle is dilated, and drawn out over the carpels, which are arranged in it like those of the rose, which they closely resemble, but are much larger. The leaves are opposite and feather-nerved. _Chimonanthus fragrans_, so well-known for its beautiful yellowish flowers, which are produced about Christmas, belongs to this order. In this plant the lobes of the calyx are oval, and not nearly so numerous as in Calycanthus; the outer lobes look like bracts. The stamens are less numerous, and not deciduous; and only five are fertile, which are united at the base. This plant was formerly called _Calycanthus præcox_. ORDER LXX.—GRANATEÆ. This order has only one genus and two species. The Pomegranate (_Punica Granatum_) has a tubular calyx, with a limb in five or seven divisions, and the same number of petals as there are segments to the calyx. The calyx and corolla are both of the same colour. When the petals fall, the tube of the calyx swells, and becomes a many-celled berry, the limb of the calyx remaining on, and forming a kind of crown to the fruit. The cells are divided into two parts, and they contain a great number of seeds which are plunged in a juicy pulp. The other species, _P. nana_, only differs in being a dwarf plant, and in the leaves being narrower. The Pomegranate was formerly included in Myrtaceæ. ORDER LXXI.—MEMECYLEÆ. Tropical trees and shrubs, with white or purplish flowers, and eatable fruit. ORDER LXXII.-COMBRETACEÆ. This order is well-known from the two beautiful climbing stove-plants, _Combretum purpureum_, and _Quisqualis indica_. The flowers of the former are disposed in racemes, which have a peculiarly light and graceful appearance, from the great length of their stamens; and as they are of a brilliant scarlet, the name of Purpureum is very ill applied to the species. The flowers of _Quisqualis indica_ have a very long slender tube to the calyx, and five velvet-like petals, which vary in colour from a yellowish white to red, changing in the course of one day. ORDER LXXIII.—VOCHYSIEÆ. Brazilian trees and shrubs, with yellow flowers, and stipulate, feather-nerved leaves. ORDER LXXIV.—RHIZOPHOREÆ.