Section 2. Flowers Unisexual (_perfect in Ulmus_); Calyx Regular, the

stamens as many as its lobes and opposite them; ovary superior, 1-celled; seed 1.

XI. Ulmaceæ (p. 308). Fruit a compressed winged samara (Ulmus), a drupe (Celtis and Trema), or nut-like (Planera), leaves simple, alternate, with stipules, deciduous (persistent in Trema). XII. Moraceæ (p. 328). Flowers in ament-like spikes or heads; fruit drupaceous, inclosed in the thickened calyx and united into a compound fruit, oblong and succulent (Morus), large, dry and globose (Toxylon), or immersed in the fleshy receptacle of the flower (Ficus); leaves simple, alternate, with stipules, deciduous (persistent in Ficus).