CLASSIFICATION OF ANGIOSPERMS. 



383 



or guelder-rose of the gardens is a sterile variety of this species. 

 Another variety {edule) is also cultivated on account of its edible 

 fruits, particularly in Canada and the Northern United States. 

 A number of species of Viburnum are rather common in 

 various parts of the United States, as the Maple-leaved arrow- 



Fig. 179- Fruiting branch of Viburnum prunifoliutn. 



wood (F. Acerifolium), which is a small shrub with deeply 

 3-lobed, coarsely dentate leaves and small, nearly black drupes ; 

 Arrow-wood (F. dentaUim), with broadly ovate, coarsely 

 dentate leaves and blue drupes, which become nearly black 

 when ripe; Soft-leaved arrow-wood {V. molle), which somewhat 



