206 MISC. PUBLICATION 303, U. S. DEPT. OF AGRICULTURE 
Prunus pygma, see Primus reverchonii. 
Pmnus reverchonii Sarg. 
P. pygma. Muns. Hog plum. 
Range: 16, 20. 
Site : Well-drained, moist, sun. 
Fruit : Drupe, available July-September. 
A small to large siirub; flowers Marcb-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 salicifolia, see Prunus serotina. 
Prunus sempervirens, see Prunus caroliniana. 
Prunus serotina ^ 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 fail 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 bobwhite, 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 'kelloggii 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. 
StomacJi records: Prairie chicken. 
Prunus tarda Sarg. Texan sloe. 
P. umhellata 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. 
®Var. salicifolia (H. B. K.) Koehne, (P. salicifolia H. B. K., P. capuli Cav. P. capollin 
Koehne), is a Mexican species apparently outside the United States. 
