206 MISC. PUBLICATION 303, U. S. DEPT. OF AGRICULTURE 



Prunus pygma, see Prunus reverchonii. 



Frunus reverchonii Sarg. 



P. pyffma. Muns. Hog plum. 



Range : 16, 20. 



Site : Well-drained, moist, sun. 

 Fruit : Drupe, available July-September. 



A small to large shrub; flowers March-April; forms dense thickets; with- 

 stands severe drought ; will grow on limestone soils. 



Prunus rivularis Scheele. Creek plum. 



P. texana Scheele, not Dietr. 

 Range: 17, 25, 29, 30. 

 Site: Well-drained, moist, sun. 

 Fruit: Drupe, available in June. 

 A large shrub. 



Prunus rufula, see Prunus virens. 

 Prunus salicif olia, see Prunus serotina. 

 Prunus sempervirens, see Prunus caroliniana. 



Prunus serotina 6 Ehrh. Black cherry. 



Range : 11, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30. 

 Site : Dry, well-drained, moist, sun. 

 Fruit: Drupe, available June-November. 



A small to large tree ; root system deep ; wind-firm ; much attacked by 

 insects and fungi ; easily injured by fire ; wood of importance commercially ; 

 4,000-5,000 seeds per pound, germination 70-90 percent. 



Stomach records: Thirty-three species of birds, including ruffed grouse, bob- 

 white, and sharp-tailed grouse; composed 0.47 percent of fall food of prairie 

 chicken in Wisconsin ; this and P. pennsylvanica composed 2.3 percent of winter 

 food of northern sharp-tailed grouse in Quebec and Ontario ; white-tailed deer. 

 Observations: Twenty-one species of birds including bob white, ring-necked 

 pheasant ; an important food of red fox ; sixth most important preferred food 

 of white-tailed deer In Massachusetts ; raccoon ; cottontail rabbit ; squirrel ; 

 black bear. 



The most poisonous species to livestock of all cherries. 



Prunus subcordata Benth. Pacific plum. 



P. subcordata Tcelloggli Lemmon. 

 Range : 2, 3, 4, 12. 

 Site: Dry, well-drained, sun. 

 Fruit : Drupe, available August-September. 



A large shrub or rarely a small tree ; flowers March-May ; thicket forming ; 

 leaves commonly shed just before fruit is ripe; fruit commonly borne only 

 every 2 years ; in the central portion of its range the fruit often develops into 

 a bladdery structure caused by a fungus; propagates not only by seed but by 

 buds formed on the roots ; occurs in sand, gravel, loam, and other soils. 



Observations: Of fair importance as browse for mule deer. Heavily browsed 

 by sheep; often killed by overgrazing. 



Prunus susquehanae Willd. Appalachian cherry. 



P. cuneata Raf., P. pumila cuneata (Raf.) Bailey. 

 Range : 23, 24, 26, 27, 28. 

 Site : Dry, well-drained, moist, sun. 

 Fruit : Drupe, available July-August. 



A small shrub ; occurs in sandy and rocky barrens ; roots long and stocky. 

 Stomach records: Prairie chicken. 



Prunus tarda Sarg. Texan sloe. 



P. umbellata tarda (Sarg.) Wight. 

 Range: 16, 17, 20, 29. 

 Site: Dry, well-drained, sun. 

 Fruit: Drupe, available October-November. 



A small to large tree ; flowers in April ; often more or less thorny ; flowers 

 abundantly produced. 



6 Var. saUdfolia (H. B. K.) Koehne, (P. salicifolia H. B. K., P. capuli Cav. P. capollin 

 Koehne), is a Mexican species apparently outside the United States. 



