ROSACEAE 169 



Eastern and Middle States. — Pennsylvania : Northampton ; Bucks ; 

 Tioga ; Susquehanna ; Lancaster. 



2. Fragaria Americana (Porter) Britton. American Wood Straw- 

 berry. (Man. p. 501 ; I. F. f. 1911.) In rocky woods, Pa. and N. J. to 

 Ont. and N. B., west to Ore. — Pennsylvania : Pike ; Bucks ; Lancaster; 

 Huntingdon; Allegheny. 



3. Fragaria Virginiana Duchesne. Virginia Strawberry. (Man. 

 p. 500; I. F. /. igoS.) In dry soil, N. B. to S. Dak., south to Fla., La. 

 and Ariz. — Pennsylvania : Monroe ; Northampton ; Bucks ; Phila- 

 delphia ; Delaware ; Chester ; Lancaster ; Franklin ; Tioga ; 

 Allegheny. 



12. DUCHESNEA J. E. Smith. 



1. Duchesnea Indica (Andr. ) Focke. Yellow or Indian Straw- 

 berry. (Man. p. 501 ; I.F. f. 1912.) In waste places, N. Y. and Pa. to 

 Fla. Nat. or adv. from India. — Pennsylvania : Northampton ; Bucks ; 

 Philadelphia ; Lancaster. 



13. COMARUM L. 



1. Comarum palustre L. Purple or Marsh Cinquefoil- (Man. 

 p. 501 ; I. F. f. igsj. ) In swamps or peat- bogs, Lab. to Alaska, N. J., 

 Iowa and Calif. Also in Eu. and Asia. — Pennsylvania : Susquehanna ; 

 Wayne ; Monroe ; Tioga ; Crawford. 



14. ARGENTINA Lam. 



1. Argentina Anserina (L. ) Rydb. Silver-weed. (Man p. 502; 

 I. F. f. 1934.) On shores and salt-meadows, Greenland to B. C, N. J. 

 and Neb., south in the Rocky Mts. to N. Mex. and Calif. Also in Eu. and 

 Asia. — Pennsylvania : Erie, Presque Isle. 



15. POTENTILLA L. 



Flowers axillary to the leaf-like bracts : stems creeping or spreading : peren- 

 nials. 

 Stems silky-villous : first flower at the second node of the stem or a succeed- 

 ing- node. I. P. Canadensis. 

 Stems silky-strigillose : first flower at the first node of the stem. 



2. P. piimila. 

 Flowers in terminal cymes : stems erect or ascending : annuals or biennials. 



Leaf-blades digitately 3-7-foliolate. 



Leaflets 3 : upper part of the achene longitudinallj' ridged; 



3. P. Monspeliensis. 

 Leaflets 5-7 : upper part of the achene smooth or reticulated. 



Leaflets green beneath, evenly toothed : corolla about 2 cm. broad : pet- 

 als longer than the sepals. 4. P. sulphurea. 

 Leaflets white-pubescent beneath, incised : corolla 4-8 mm. broad : pet- 

 als shorter than the sepals. 5. P. argentea. 

 Leaf-blades pinnately 7-1 i-foliolate. 6. P. paradoxa. 



1. Potentilla Canadensis L. Five-finger. (Man. p. 506; I. F. _/". 

 ^935-) In dry soil, Quebec to Minn., Ga. and the I. Terr. — Pennsylva- 



