PRUNUS 125 



first pubescent, becoming glabrate; buds acute, velvety. Sandy 

 soil, mostly in the coastal plain, Maine to Delaware (Fig. 156). 



2. P. allegheniensis Porter. Alleghany Plum . A straggling 

 shrub 1-5 m. high, sometimes armed with sharp-pointed twigs; 

 bark brown; twigs reddish-brown. Dry soil, mostly in the moun- 

 tains, Connecticut to Virginia and West Virginia (Fig. 157). 



3. P^ americana Marsh. Wild Plum . A shrub or tree 3-10 m. 

 high, bark dark, shaggy; twigs orange-brown, sharp-pointed, 

 glabrous; buds acute, 3-6 mm. long, chestnut-brown. Thickets, 

 Florida to New Mexico, north to New England, Ontario, Manitoba, 

 Wyoming, and Utah; also in Mexico (Fig. 158). 



4. ^. hortulana Bailey. Wild Goose Plum. A small unarmed 

 tree, 10 m. high or less; twigs glabrous, reddish-brown; buds 

 obtuse, chestnut-brown. Bottomlands, Indiana to Iowa, south to 

 Alabama and Oklahoma (Fig. 159). 



5. P_. angustifolia Marsh. Chickasaw Plum . A shrub 2-5 m. 

 high, not very thorny; buds half covered by the ciliate leaf-cushion; 

 twigs slender, red, lustrous. Dry thickets, Florida to Texas, 

 north to New Jersey and Missouri (Fig. 160). 



6. P. persica (L. ) Batsch. Peach. A small tree, up to 8 m. 

 tall, the reddish or green twigs glabrous; buds hairy. Introduced 

 from Asia, much cultivated, and frequently escaped (Fig. 161). 



7. P. pensylvanica L. f . Fire Cherry . Pin Cherry . Bird 

 Cherry. A tree 6-20 m. high, with light red-brown bark; twigs 

 glabrous, slender, reddish, shining. Dry woods, recent burns 

 and clearings, Labrador to British Columbia, south to Colorado, 

 South Dakota, Iowa, and in the mountains to North Carolina (Fig. 

 162). 



S- E' avium L. Sweet Cherry . A large tree, sometimes 20 m. 

 high, with pyramidal crown and reddish-brown bark; twigs rather 

 thick, buds large, glossy, ovoid -fusiform. Introduced from Eurasia, 

 often spread from cultivation and naturalized (Fig. 163). 



9. P. cerasus L. Sour Cherry. Tree to 24 m. high, of pyram- 

 idal habit; branchlets rather thick; buds large, dull, round-ovoid. 

 Introduced from Asia, spread from cultivation and naturalized 

 (Fig. 164). 



10. P^ mahaleb L. Mahaleb. Perfumed Cherry . Small tree 

 to 10 m. high, with open branching; bark aromatic; twigs tomen- 



