178 DRUPACEAE 



b. Inflorescence corymbose : drupes less than 7.5 mm. in diameter. 



8. P. Pennsylvanica. 



B. Flowers in racemes terminating leafy branches of the year. 

 Racemes corymb-like. 9- P- Mahaleb. 

 Racemes elongated. 



Sepals deciduous : leaf -blades with sharp somewhat spreading teeth : 

 drupe mainly astringent. 

 Stone smooth : petals less than 5 mm. long. 10. P. Virginiana. 



Stone roughened : petals over 5 mm. long. 11. P. Padus. 



Sepals persistent : leaf-blades with appressed blunt teeth : drupe mainly 

 sweet. 12. P. serotina. 



1. Prunua Americana Marsh. Wil<D YEi<l,ow OR RED Plum. (Man. 

 p. 524 ; I. F. /. 2001.) In woods and thickets, N. Y. to Mont., Fla. and 

 Co\o.— Pennsylvania : Northampton ; Bucks ; Dei,aware ; Chester ; 

 Lancaster ; Luzerne ; Frankwn ; Huntingdon ; Somerset ; Alle- 

 gheny. 



2. PrunuB Allegheniensis Porter. PORTER'S PLUM. (Man. p. 524 ; 

 I. F. f. 2012.) In thickets, Allegheny Mountains, Pa. — Pennsylvania: 

 Huntingdon, Barrens ; ClEareield ; Elk. 



3. PrunuB spinosa L. Sloe. Blackthorn. Buckthorn. (Man. 

 p. 525 ; I. P. /. 20i6.) Along roadsides, Mass. to Pa. and N. J, Nat. 

 or adv. from Eu. — Pennsylvania : Philadelphia ; Delaware. 



4. Prunus CeraBUB L. Sour Cherry. (Man. p. 525 ; I. F. /. 2020.) 

 In woods and thickets, N. Y. and Pa., to the Gulf States. Native of Eu. 

 — Pennsylvania : Northampton ; Bucks ; Allegheny. 



5. PrunuB Avium L. Wild or Sweet Cherry. (Man. p. 525 ; I. 

 F. /. 2021.) In thickets and woodlands. Conn, to Pa. and the Gulf 

 States. Native of Eu. — Pennsylvania : Northampton ; Bucks ; Mont- 

 gomery ; Lackawanna ; Allegheny. 



6. PrunuB cuneata Raf. Appalachian Cherry. (Man. p. 525 ; I. 

 F. f. 2018.) In wet soil, or among rocks, N. H. to Minn., N. C. and 

 Wis. — Pennsylvania : Northampton ; Lancaster, N. Texas ; Chester. 



7. PrunuB pumila L. Sand or Dwarf Cherry. (Man. p. 525; 

 I. F. f. 20iy.) On sand or gravelly shores, N. B. to Man., N. J. and 

 Mich. — Pennsylvania : Northampton ; Bucks ; Allegheny. 



8. PrauuB PennBylvanioa L. f. Wild Red or Pin Cherry. 

 (Man. p. 526; I. 'B. y. 2022.) In rocky woods and clearings, Newf. to 

 Ga., west to the Rocky Mts. — Pennsylvania : Pike ; Monroe ; North- 

 ampton ; Schuylkill ; Luzerne ; Blair ; Cambria ; Erie. 



9. PrunuB Mahaleb L. PERFUMED CHERRY. (Man. p. 526 ; I. F. /. 

 2023.) Thickets and waste places, N. Y. and Pa. Adv. from Eu. — 

 Pennsylvania : Lancaster ; Northampton ; Franklin. 



10. PrunuB Virginiana L- Choke Cherry. (Man. p. 526; I. F. /. 

 2024.) Along river banks and in rocky situations, Newf. to Man., B. 



C, Ga., Tex. and Colo. — Pennsylvania : Pike ; Monroe ; North- 

 ampton ; Bucks ; Schuylkill ; Berks ; Montour ; Tioga ; Lehigh ; 

 Chester ; Delaware ; Allegheny. 



