272 BIRD CHERRY 



[These closely-allied species of Prunus are distinguished 

 as follows. The leaves of P. Cerasus are narrower and 

 more lanceolate, and more taper-based than those of 

 P. Padus, and irregularly crenate-serrate ; those of the 



Fig. 102. Bird Cherry, Prunus Padus, p. 270 (D). 



latter are broader and more elliptical or ovate, acutely 

 bi-serrate and somewhat obliquely cordate at the base. 

 The leaves of P. Avium resemble those of P. Cerasus, but 

 droop more as if flaccid instead of firm and erect. 



Other species with glands on the petioles are Salix 

 pentandra and Viburnum Opulus. Prunus Laurocerasus 

 has glands on the lower part of the lamina.] 



