The Coffee-tree (_Coffea arabica_) differs from the other Rubiaceæ in the tube of its calyx being very short and disappearing when the ovary begins to swell; and in the filaments of the stamens being sufficiently long to allow the anthers to be seen above the throat of the corolla (see _a_ in _fig._ 39). The limb of the corolla (_b_) is five-cleft, and the style (_c_) bifid. Each ovary when its flower falls, becomes distended into a berry (_d_) or rather drupe, containing the nut _e_, in which are two seeds, flat on one side, and convex on the other, which are placed with the flat sides together, as shown at _f_; each seed having a deep longitudinal groove, as shown at _g_. These seeds are our coffee. [Illustration: FIG. 39.—COFFEE. (_Coffea Arabica._)] The flowers of _Ixora coccinea_ have the same general construction as those of the other plants of the order. The calyx has an ovate tube, and a very small four-toothed limb; and the corolla is salver-shaped, with a long and very slender tube, and a four-parted spreading limb. There are four anthers inserted in the throat of the tube of the corolla, and just appearing beyond it, and rising a little above them is the point of the style with its two-cleft stigma. The berry is two-celled, but it differs from that of the coffee in retaining the lobes of the calyx, which form a sort of crown. There are many kinds of Ixora, all stove shrubs, and all conspicuous for their large heads or rather corymbs of showy flowers. The genus Pavetta has been divided from Ixora, principally because the species composing it have the style projecting considerably beyond the corolla, instead of only just appearing above it.