The Flora of the Cayuga Lake Basin 259 



3. P. arguta Pursh. 



Dry rocky banks and in sandy or gravelly fields, in nearly neutral soils ; scarce. 

 May 20-Aug. 



Indigenous apparently along the lake shore s. of Esty Glen (£>. !), and possibly 

 also s. of the Fleming Schoolhouse (D.). Adventive as a weed: sandy sterile soils, 

 top of North Pinnacle, Caroline; near Headwaters Swamp; dry pasture s. e. of 

 Buttermilk Falls; s. of McLean, 1881 (D.) ; gravelly knoll near Malloryville Bog; 

 sandy pasture, crest of Salmon Creek ravine s. of Genoa. 



E. Que. and N. B. to Alaska, southw. to Va., 111., Kans., and Colo. ; rare or absent 

 on the Atlantic Coastal Plain. 



4. P. Anserina L. Silverweed. 



Calcareous or saline, sandy or gravelly, shores ; frequent. June-Aug. 



Summit Marsh (D.) ; Cayuta Lake {D.) ; Cortland marl ponds (£).!); lake 

 shore, Renwick (D.\) ; "on all the sandy points to Cayuga and Montezuma Marshes " 

 (£>.) ; Venice Center; Aurora; Union Springs; Cayuga Lake Park. 



Arctic Am., southw. to n. N. J., Ohio, Iowa, N. Mex., and Calif. Regarded by 

 some botanists as introduced in the eastern U. S. 



5. P. recta L. (P. sulphur ea Lam.) 



Dry fields and roadsides, usually in the lighter nonacid soils ; abundant but local. 

 June 20-Aug. 10. 



First reported from "near Union Springs, 1875" (D.) ; in recent years becoming 

 rapidly more abundant, and now common on Cornell and Cayuga Heights and between 

 Cayuga and Seneca Lakes ; elsewhere mostly absent, or infrequent. 



Me. to Mich., southw. to Va. and 111. Naturalized from Eu. 



Following many early authors, P. recta is here made a synonym of P. sulphured 

 Lam. rather than of the var. obscura. 



5a. P. recta L., var. obscura Koch. (See Wolf in Bibliot. Bot. 16, Heft 71:343. 

 1908. P. recta Rydb. in N. A. Flora 22 : 309. 1908.) 



In a waste scrubby field at the mouth of Big Gully, 1919 (K. M. W ., A. J. E., 

 & L. F. Randolph) . 



Infrequent in Europe, and apparently only occasional in the United States. The 

 petals of the Big Gully specimens slightly exceed the sepals, while in European 

 specimens the petals are shorter than the sepals. The appearance of both American 

 and European specimens strongly suggests a hybrid origin, with P. recta and P. nor- 

 vegica as parents. 



6. P. norvegica L., var. hirsuta (Michx.) Lehm. (See Bibliot. Bot. 16, Heft 71: 



404. 1908. P. monspeliensis of Gray's Man., ed. 7. P. norvegica of Cayuga Fl.) 

 Cinquefoil. 



A weed in cultivated fields and in waste places, in moist rich soils ; common. July 

 (Aug.-Oct.j. 



Lab. to Alaska, southw. to D. C, Mo., Kans., and N. Mex., including the Atlantic 

 Coastal Plain. Found also in Asia. Possibly not native. 



7. P. argentea L. Silvery Cinquefoil. 



Dry gravelly or rocky hillsides and in sterile sandy lawns, in both acid and calca- 

 reous regions ; frequent. June-July. 



N. S. to Dak., southw. to D. C, Ind., and Kans., including the Coastal Plain. Found 

 also in Eu. Possibly introduced in Am. 



