More Stations for Potentilla tridentata 



Raymond H. Torrey 



Search during recent months for more stations of the Moun- 

 tain or Three-Toothed Cinquefoil, Potentilla (Sibbaldiopsis) 

 tridentata, has disclosed three occurrences, at least one of which 

 appears to be new in the records. 



After searching several summits in the Pocono Mountains 

 in Monroe County, Pennsylvania, including Camelback, Bear 

 Mountain and Skytop, with E. M. Zimmerman of Bethlehem, 

 Pa. last fall, without result, an expedition was made farther 

 west, in Luzerne County, following the report in Norman Tay- 

 lor's catalogue of plants in the Torrey Botanical Club's territory 

 that Potentilla tridentata occurs on high summits in that 

 county. Mr. Zimmerman thought Penobscot Knob, 2000 feet 

 high, near Mountaintop, southwest of Wilkes-Barre a likely 

 spot and so it proved. On the rocky ridge east and west of the 

 fire observation tower acres of the plant were found in full 

 bloom in mid-June. It was large, healthy and well flowered. It 

 extended for more than a mile, and other ledges of the same 

 character seen but not explored probably support it. It is the 

 largest colony this writer has seen south of New England. 



A few weeks later, Mr. Zimmerman found Potentilla tri- 

 dentata in bloom, on Cresco Heights, 1750 feet, in Monroe 

 County, about a mile north of Cresco station on the Lacka- 

 wanna Railroad. It was a small colony, but interesting as it is 

 not reported in Monroe County by Taylor. We had not included 

 this point in our search of the previous fall. 



On Aug. 7, L. W. Anderson of Elizabeth, N. J., and I found 

 Potentilla tridentata, on the cliffs of Sam's Point, just within the 

 boundary of Ulster County, at an elevation of 2200 feet. Al- 

 though I have not heard any previous report of the plant in 

 the Shawangunks, it always seemed to me it ought to grow 

 there. It is found on the eastern front of the Catskills, at 2500- 

 3000 feet; on Schunemunk Mountain, at 1300 feet, and on 

 Kittatiny Mountain (High Point, 1800 feet) the New Jersey 

 extension of the Shawangunks. Yet it was not found in the 

 northern Shawangunks, about Lake Minnewaska, in a search 

 there in April. A trip to Sam's Point, to determine if it occurred 

 there, was successful. The colony is not large, but appears to 



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