270 Karl M. Wiegand and Arthur J. Eames 



6. P. susquehanae Willd. (See Rhodora 25:73. 1923. P. putnila of Cayuga Fl. 



P. cuneata Raf. and of recent authors.) Dwarf Cherry. 

 Low sandy, gravelly, or loamy fields and banks, in acid soils ; rare. May 10-June 1. 

 South Hill Marsh, the only station, 1882 (F. C. Curtice, £>.!). Reported elsewhere 

 in N. Y. State from L. I., Albany, Ausable Point, and Penfield. 



S. Me. to Minn., southw. to N. C. ; rare or absent on the Coastal Plain. 



7. P. cerasus L. Sour Cherry. 



Frequently escaping from cultivation to roadsides. May. 



Danby ; n. of Enfield Glen ; road to Buttermilk Falls ; Turkey Hill ; Forest 

 Home; Renwick slope (D.) ; near Ludlowville; and elsewhere. 

 Native of s. Eu. 



8. P. avium L. Sweet Cherry. 



Escaping from cultivation like the last preceding species, but much more common 

 and well established, chiefly in the heavier soils. May. 



Hedgerows, South Hill, abundant; West Hill, in Enfield, Newfield, and Ithaca; 

 Turkey Hill ; and elsewhere ; " all ravines near Ithaca, . . . where it forms small 

 thickets and groves on the cleared banks" (D.). These wild forms seem to be mostly 

 of the type with heart-shaped, almost black, fruit, and very succulent flesh, and are 

 probably the Black Tartarian variety. Red-fruited trees occur rarely, as on South 

 Hill and n. of Coy Glen. These have the appearance of being a color variation from 

 the dark-fruited form. 



Native of Eurasia. 



9. P. pennsylvanica L. f. Pin, Pigeon, or Wild Red Cherry. 

 Thickets, clearings, and ravines, in gravelly soils ; common. May 10-25. 

 Most abundant in the McLean region ; frequent elsewhere. 



Lab. to B. C, southw. to Pa., the Great Lakes, Iowa, and in the mts. to N. C. and 

 Colo. ; frequent on the northern Atlantic Coastal Plain. 



10. P. Mahaleb L. Mahaleb or St. Lucie Cherry. 

 Roadsides and thickets, in gravelly soil ; rare. May 20- June 10. 



Roadside, South Ave., Ithaca (F. P. Metcalf) ; Taughannock Point; Cayuga Lake 

 shore, s. of Union Springs. 

 Native of Eu. Used for cherry stock and occasionally spontaneous. 



11. P. virginiana L. Choke Cherry. 



Rocky banks, hedgerows, and thickets, in rather heavy dry soils, apparently 

 with little relation to lime content; common, and generally distributed. May 5-30. 



Newf. to S. Dak., southw. to Fla., Kans., and Tex. ; rare on the Coastal Plain. 



Authors differ widely as to the application of the Linnean name P. virginiana, and 

 the matter is not yet clearly settled. 



12. P. serotina Ehrh. Wild Black Cherry. Timber Cherry. 



Dry woods and thickets, in sandy, gravelly, or stony soil with little regard to lime 

 content; common. May 20-June 10 (about two weeks later than the last preceding 

 species). 



N. S. to N. Dak.,^outhw. to Fla. and Ariz., including the Coastal Plain. 



66. LEGUMINOSAE (Pulse Family) 

 Artificial Key to the Genera 



a. Corolla not papilionaceous. 



b. Flowers small, whitish or greenish ; trees. 

 c. Calyx elongated; stamens 10; leaflets ovate, acute. 1. Gymnocladus 



