474 



ILLUSTRATIONS OF THE NATURAL ORDERS. 



celled (sometimes two-celled) ovary and the always one-celled and 

 one-seeded fruit, but sometimes enclosing it. Stamens as many as 

 the lobes of the calyx and opposite them, or sometimes fewer. Em- 

 bryo large ; cotyledons mostly broad ; the radicle superior in the 

 fruit. Stipules often deciduous. A large and greatly diversified 

 order, comprising at least four well-marked suborders. 



912. Sllbord. I'llMCes {Elm Family). Trees or shrubs, with a 

 watery juice, alternate rough leaves, perfect or merely polygamous 

 flowers, two styles or stigmas ; the ovary either one- or two-celled, 

 with one ovule suspended from the summit of each. Fruit either a 

 samara (Fig. 578), with a straight embryo and no albumen, as in 



the Elm (Ulmus) ; or a drupe with a curved embryo and scanty 

 albumen, as in Celtis (Hackberry), the type of the tribe Celtide^e. 

 Timber-trees. The inner bark of the Slippery Elm is highly 

 charged with mucilage. Hackberries are edible. 



913. Sllboi'd. ArtOCarpCEB {Bread-fruit Family) ; which are chiefly 

 tropical trees or shrubs with a milky or yellow juice ; the moncc- 

 cious or dioecious flowers mostly aggregated into fleshy heads, and 



FIG. 1156 Flower of the Slippery Elm 1157 Calyx laid open and the ovary divided ver- 

 tically. 1153 Fruit, the cell laid open to show the single seed. 1159 The latter magnified. 

 11G0. Its embryo. 



FIO. 1161 Uranch of Celtis Americana, in flower. 1162. Enlarged flower, divided verti. 

 eally. 1163. Drupe, the flesh divided to show the stone. 1163'. The coiled embryo. 



