206 MISC. PUBLICATION 303, U. S. DEPT. OF AGRICULTURE 
Prunus pygma, see Prunus reverchonii. 
Prunus reverchonii Sarg. 
P. pygma, 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 salicifolia, see Prunus serotina. 
Prunus sempervirens, see Prunis caroliniana. 
Prunus serotina ° Ehrh. Black cherry. 
Range: 11518, 19, 20, 21.522) 23; 24, 25,26, 20,.28.029..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 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: fiowers 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. salicifolia (H. B. K.) Koehne, (P. salicifelia H. B. K., P. capuli Cav. P. capollin 
Koehne), is a Mexican species apparently outside the United States. 
