DICOTYLEDONOUS PLANTS 



117 



4. P. virginiana, L. CHOKECHERRY. A shrub or small tree, 

 5-20 ft. high. Leaves thin, oval or obovate, pale, pointed, sharply 

 serrate. Flowers small, white, in short racemes. Fruit bright red, 

 turning at length to dark crimson, very puckery until fully ripe. 

 River banks and thickets. 



5. P. serotina, Ehrh. WILD BLACK CHERRY. Often becoming a 

 large tree; bark on old trees rough, nearly black. Leaves rather 

 thick, oval to lanceolate-ovate, acute or taper-pointed at the apex, 

 finely serrate with calloused teeth, smooth above, downy on the veins 

 beneath. Racemes terminal, long and spreading. Flowers white. 

 Fruit globose, about \ in. in diameter, purplish-black. In rich 

 woods. Wood much used in cabinet-making.* 



6. P. Cerasus, L. CHERRY. Often becoming a large tree. 

 Leaves oval or ovate, acute or taper-pointed at the apex, rounded at 

 the base, irregularly serrate-dentate, smooth on both sides, resinous 

 when young. Flowers in lateral umbels, white ; pedicels long and 

 slender. Fruit globose, red or black. This is the European species 

 from which most of our cultivated varieties have been developed.* 



46. LEGUMINOS^. PULSE FAMILY. 



Herbs, shrubs, or trees. Leaves alternate, usually com- 

 pound (either pinnately or palmately), with stipules, the leaf- 

 lets mostly entire. Calyx of 5 sepals, which are more or less 

 united, often somewhat irregular. Corolla, of 5 petals, often 



FIG. 14. I, Diagram of Flower of Sweet Pea, Lathyrus odoratus. II, Vertical 

 Section of Flower (magnified). Ill, Calyx (magnified). 



Ill 



FIG. 15. I, Stamens and Pistil of Sweet Pea (magnified). II, Fruit.. Ill, Part of 

 Fruit, showing one seed. 



