STORKS AGRICULTURAL EXPERIMENT STATION. 341 



143. Twigs and buds bright green; leaf-scars oval to broadly crescent- 

 shaped; buds pointed, with long, silky hairs, often nearly smooth; 

 pith with more or less distinct transverse woody partitions in the 

 ground mass; bark smooth; in New England usually a shrub, 

 growing wild in deep swamps in Eastern Massachusetts, also 

 extensively cultivated. Sweet Bay, Swamp Bay, Laurel Magnolia, 



Beaver Tree. (Magnolia virginiana L. ; M. glauca L. ) 



under Comparisons p.470 



THE CHERRIES, PLUMS AND PEACH 

 Prunus. 



Leaf-scars alternate, more than 2-ranked; bundle-scars 3; stipule-scars 

 present, inconspicuous, or absent; buds with scales overlapping* in sev- 

 eral rows; terminal bud present or absent; fruit a drupe. 



144. Terminal bud present 145 



144. Terminal bud absent. (Plums) 150 



145. Twigs densely speckled with very minute pale dots, brightly 

 colored, generally green-yellow below and more or less reddish 

 above and highly polished; buds generally densely downy at least 

 toward apex; collateral buds usually present 



. . . ' Peach. (Prunus Persica)p.512 



145. Twigs not densely speckled with very minute dots; buds not 

 densely downy; collateral buds absent (occasionally present in 

 Wild Red Cherry) 146 



146. Buds clustered at tips of all shoots; twigs under 2.5 mm. thick. 

 "Wild Red Cherry. (Prunus pennsylvanica)p.500 



146. Buds not clustered, or clustered only on short fruit spurs; twigs 

 over 2.5 mm. thick 147 



147. Short stout slow-growing fruit spurs present with buds clustered 

 at their tips; European species 148 



147. Short fruit spurs absent; native species 149 



148. Habit erect, generally with a central leader 



Sweet Cherry (Prunus avittm^p.502 



148. Habit spreading, without central leader; buds smaller; twigs more 

 slender , Sour Cherry (Prunus Cerasus) p.504 



149. Buds generally over 5 mm. long; bud-scales gray-margined; bark 



smooth ; generally only a shrub 



Choke Cherry (Prunus virginiana) p.498 



149. Buds generally under 5 mm. long; bud-scales uniform in color; 



bark becoming rough-scaly; a small to large tree 



Wild Black Cherry (Prunus serotina)p.49Q 



150. Native species, growing wild 151 



150. Cultivated species. Varieties chiefly of the American, European, 

 or Japanese type of Plum, p.508 



151. Buds generally under 4 mm. long 



American Wild Plum (Prunus am eric ana) p. 508 



151. Buds generally over 4 mm. long. Canada Plum (Prunus nigra)p.50Q 



THE SUMACHS 

 Rhus. 



Shrubs or small trees with pithy twigs and milky or watery juice; 

 leaf-scars alternate, more than 2-ranked; bundle-scars numerous scat- 

 tered or in a single curved line; stipule-scars absent; terminal bud 

 present or absent; fruit a small drupe borne on erect or drooping 1 

 clusters. 



152. Terminal bud present; fruit smooth white in loose drooping clus- 

 ters Poison Sumach (Rhus Vernix) p.528 



152. Terminal bud absent; fruit more or less hairy, red, in dense erect 



clusters . 153 



