STORKS AGKICULTUEAL EXPERIMENT STATION. 341 



Twig-s 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 Bny, Swamp Bay. Laurel Magnolia, 



Beaver Tree. (Maymilia 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 14.5 



144. Terminal bud absent. (Plumsj l.jO 



145. Twig-s 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'tl2 



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

 densely dow^nj-; collateral buds absent (occasionally present in 

 Wild Red Cherry) 146 



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

 AVild Red Cherry. (Prunus pen^isylvanica) p. ^*00 



146, Buds not clustered, or clustered onlj' on short fruit spurs; twigs 

 over 2.5 mm. thick 147 



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

 at their tips; European species 148 



147. Short fruit spurs absent; native species 149 



148. Habit erect, generally "unth a central leader 



S«-eet Cherry (Prunus aviu.m)p.'*0'2 



14S. Habit spreading, without central leader; buds smaller; twigs more 

 slender Sour Cherry (Pi-unus 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. 49S 



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



bark becoming rough-scaly; a small to large tree 



\\ild Black Cherry (Prunus serotina^ p.496 



150. Native species, growing wild 151 



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

 or Japanese type of Plum. p.50S 



151. Buds generally under 4 mm. long 



American AA'ild Plum (Prunus americana ) p.^OH 



151. Buds generally over 4 mm. long. Cauada Plum (Prunus nigra)p.^09 



THE SUMACHS 



Rhus. 



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

 leaf-scars alternate, more than 2-ranked; bundle-sears 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 

 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 



