24 Wyoming Experiment Station. 



and sharply toothed. The berries are about three-eighths of an 

 inch in diameter, red in color changing to purple-black when 

 ripe. This species is common about thickets and along streams 

 throughout the state. 



Long-spine Haw (Crataegus macracantha (Ivindl.) Lodd.) 



More shrub-like than the preceding and with broader leaves 

 and fruits which are red when ripe. The leafstalks and young 

 branches are somewhat hairy, as also the under surfaces of the 

 leaves. This haw is known to occur in the northeastern part 

 of the state. 



PLUM FAMILY. 

 (Drupaceae). 



This family embraces various trees and shrubs bearing stone- 

 fruits (drupes), the stone-like seed or pits singly in each fruit. 

 To it belong the plums, cherries, the almond, apricot and the 

 peach. In this state it is represented by the wild plum and by 

 three native cherries. 



Wild Plum (Primus Americana Marsh). 



The common wild plum occurs along streams at lower alti- 

 tudes in the eastern part of the state. It may be distinguished 

 in its winter condition from the native choke-cherry by its tree- 

 like habit of growth and by its branches, which are more or less 

 thorny. Its leaves also have larger teeth and are more pointed 

 than those of the choke-cherry. 



The wild plum has given rise to forty or more named varie- 

 ties cultivated for their fruits. Even in its wild state the fruits 

 are of good quality and very desirable for preserves and jams. 

 This native fruit is easily brought under cultivation, and when 

 grown in the garden produces a better quality of fruit than in 

 the wild state. Its masses of white flowers in spring and its 

 graceful head make it a desirable ornamental. It forms a very 



