DRUPACEAE (PLUM FAMILY) 



3 a Tree cultivated for the fruit, and escaped 



APPLE. (M. mains*) 

 b Shrubs or small trees planted for their flowers 4 



4 a Flowers single; twigs often with thorns 



FLOWERING CRAB. (M. floribunda*) 

 b Flowers usually more or less double; twigs not thorny 5 



5 a Leaves comparatively thick; stalks of flowers reddish; 



fruit brownish-red when ripe 



PARKMAN'S FLOWERING CRAB. (M. halliana*) 

 b Leaves comparatively thin; stalks of flowers not usually 

 reddish; fruit reddish-yellow when ripe 



CHINESE FLOWERING CRAB. (M. spectdbiHs.*) 



12 DRUPACEAE. Plum Family. 

 i PRUNUS. 



1 a Flowers in racemes 2 



b Flowers in umbels or corymbs 4 



2 a Small tree planted for the flowers; flowers Vz-i in. 



broad EUROPEAN BIRD CHERRY. (P. padus*) 



b Trees or shrubs, wild, not planted; flowers Vi-Vz 



in. broad 3 



3 a Leaves mostly oblong, the teeth somewhat incurved 



WILD BLACK CHERRY. (P. serotina.) 

 b Leaves mostly obovate, the teeth somewhat spreading 



CHOKE CHERRY. (P. virginiana.) 



4 a Prostrate or ascending shrub 1-6 ft. long growing on 



sandy shores; leaves oblanceolate 



SAND CHERRY. (P. piimila.) 

 b Erect shrubs or trees 5 



5 a Small tree with thorns; usually wild species; leaves 



abruptly pointed at apex; flowers about i in. broad 



WILD PLUM. (P. americana.) 

 b Trees or shrubs not with thorns 6 



6 a Shrub 1-4 ft. high; leaves somewhat wedge-shaped; 



flowers V-V'2. in. broad; fruit black, without bloom 



APPALACHIAN CHERRY. (P. cuneata.) 

 l> Shrubs or trees with flowers %-2 in. broad 7 



7 a Small tree with rounded, heart-shaped aromatic leaves; 



cultivated for the flowers 



PERFUMED CHERRY. (P. mahaleb*) 

 b Trees or shrubs not with rounded, aromatic leaves.... 8 



8 a Small tree ; leaves usually shining on both sides ; fruit 



about V\ in. in diameter; wild species 



PIGEON CHERRY. (P. pennsylvdnica.) 

 b Shrubs or trees not completely as in a 9 



169 



