192 FLORA OF PHILADELPHIA. 



Inflorescence umbellate, the clusters sessile or nearly so. 



Leaves convolute in vernation, fruit mostly large; pit more or less 

 flattened. 

 Umbels several-flowered. 



Leaves abruptly acuminate, drupe red or, yellow. 



1. P. Americana. 

 Leaves acute, gradually acuminate or obtiisish, drupe red 

 or purple;. 

 Leaves glabrous when mature. 2. P. angustifolia. 

 Leaves pubescent, at least on the lower surface, when 

 mature. 3. P. maritimd. 



Umbels only 1-2-flowered. 4. P. spinosa. . 



Leaves conduplicate in vernation; fruit mostly small; pit mostly 

 ■ ' • '■ ' globose. 



Flowers 6-12 mm. broad; low shrubs. 



Leaves oblanceolate or spatulate. i 5. P. pumila. 

 Leaves oval, oblong, or slightly obovate. 



6. P. cuneata. 

 Flowers 15 J 30 mm. broad; trees. 



Leaves glabrous; pedicels short; fruit sour. ,■,-,,; 



7. P. Cerasus.. »■ 

 Leaves pubescent beneath, at least on the veins; pedicels 



long; fruit sweet. 8. P. Avium.'-' 



Inflorescence more or less corymbose; leayes shining. 



■ ,, > , . .. 9. P. Pennsylvawica. 



Flowers corymbose, terminating twigs of the season. 10. P. Mdhaleb. 

 Flowers racemed, terminating branches of the season. 



Fruit red to purple, astringent; leaves obovate or oval. • ;■ 



11. P. Virginiana. 

 Fruit purple or purplish-black, sweet or bitter. 12. P.serotinp,. 



1. Prunus Americana Marsh. , Wild, Yellow, or, Bed Plum. , M. p. .524. 



Borders of woodlands. Spring. 



2. Prunus angustifolia Miehx. Chickasaw Plum. M. p. 524. Dry s>oilf 



escaped from cultivation. Early summer. > 



Delaware— Between Morton Station and Darby Creek Ferry, Ridley, 

 Dr. Geo. Smith (Fu.). 



Salem— J^ear Penn Grove (C). ; 



New Castle— Summit Bridge, Collins, Commons. 



3. Prunus maritima Wang. Beach Plum. M. p. 524. Sea-beaches and 

 .1 .. vicinity. Spring. ,., 



4; Prunus spinosa L. Sloe, Black Thorn. ' M. p. 525. Roadsides and 

 waste places. Spring. 

 Philadelphia— B&rtiam 's Garden (Je.). Bucks— ; Near Perkasie (Fr.)J 

 Delaware— Burn Brae, near Clifton, Dr. Geo. Smith (Fu.), Lansdowne 

 !,.C?e.)--: 



Mercer— Trenton (C). Hunterdon— Bosemont (C). 



5* Prunus pumila L. Dwarf Cherry, Sand Cherry. M. p. 525. Bocks and 

 sandy banks. Spring. 

 Bucks — Point Pleasant (Fr.). Lancaster — - Pleasant Grove (Ca.). 

 Northampton — Getter's Island near Eastern, Porter (B. 0.).' 

 Hunterdon — Booles' Island (Br.). 



6. Prunus cuneata Raf . M. p. 525., In wet soil or among rocks. Spring. 

 Chester— (P.). Lancaster— New Texas (P.). Northampton— (P.). 



