This section is from the book "Handbook Of Hardy Trees, Shrubs, And Herbaceous Plants", by W. Botting Hemsley. Also available from Amazon: Handbook of hardy trees, shrubs, and herbaceous plants.
Trees, shrubs, or herbs of variable habit with the branches often tetragonal. Leaves usually opposite, exstipulate. Calyx-lobes valvate. Petals usually crumpled. Stamens definite or rarely numerous. Fruit usually free from the calyx-tube. This order comprises several very curious genera, including the Pomegranate (Punica Granatum), referred here by some botanists. It is remarkable for the applej like fruit having two series of carpels one above the other. Formerly, this was more generally cultivated in boxes or large pots for standing out in the Summer time. The flowers are usually scarlet, but there is a white and also a yellow variety, and also a double flowered form as depicted in the cut (fig. 103).
Fig. 103. Punica Granatum flore pleno. (1/4 nat. size.)