J,92 FLORA OF PRILADELPHIA. 



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 obtusish, drupe red 

 or purple. 

 Leaves glabrous when mature. 2. P. angustifolia. 

 Leaves pubescent, at least on the lower surface, when 

 mature. 3. P. maritima. 



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



Leaves eonduplicate in vernation; fruit mostly small; pit mostly 

 globose. 

 Flowers 6-12 mm. broad; low shrubs. 

 I Leaves oblanceolate or spatulate. 5. P. pu7nila. 



Leaves oval, oblong, or slightly obovate. 



6. P. cuneata. 

 Flowers 15-30 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 ; leaves shining. 



9. P. Fennsylvanica. 

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

 Flowers raeemed, 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. serotina. 



1. Prunus Americana Marsh. Wild Y^low or Bed Plum. M. p. 524. 



Borders of woodlands. Spring. 



2. Prunus angustifolia Michx. Chickasaw Plum. M. p. 524. Dry soil, 



escaped from cultivation. Early summer. 

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

 Dr. Geo. Smith (Fu.). 



Salem — Near Penn Grove (C). 



New Castle — Summit Bridge, Collins, Comvxons. 



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



vicinity. Spring. 



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



waste places. Spring. 



Philadelphia— 'BaTtram's Garden (Je.). Bmc^s— Near Perkasie (Fr.). 

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

 (Pe.). 



If e?-cer— Trenton (C). Hunterdon— 'RoBemont (C). 



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



sandy banks. Spring. 

 Bucks — Point Pleasant (Fr.). Loncaster — Pleasant Grove (Ca.). 

 Northampton — Getter's Island near Easton, Porter (B. C). 

 Hunterdon — Booles' Island (Br.). 



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



Chester — (P.). Lo^casip?-— New Texas (P.). Northampton — (P.). 



