CLASSIFICATION OF ANGIOSPERMS. 



383 



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

 Another variety {cdnlc) 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. Species of Viburnum: A, Viburnum molle; B, V. prunifoUum; 

 C, V. Opulus; D, V. dentatum; E, V. nudum; F, 1'. Acerifolium. 



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

 3-lobed, coarsely dentate leaves and nearly black drupes (Fig. 

 179, F) ; Arrow-wood (V dentatum), with broadly ovate, 

 coarsely dentate leaves and blue drupes, which become nearly 

 black (Fig. 179, D) ; Soft-leaved arrow-wood {V. molle), which 



