Shafer : Vascular Flora of Allegheny County. 49 



SAXIFRAGACE.E Dumortier. 

 SAXIFRAGE FAMILY. IV-39. 

 SAXIFRAGA I.innreus. 



* S. Virginiensis Michaux. Early saxifrage. 



* S. Pennsylvanica Linnaeus. Swamp saxifrage. 



Pine Townsliip, swamp west of Wexford. June, 1896. 



TIARELLA Linnaeus. 



* T. cordifolia Linnaeus. Coolwort. 



Pittsburgh, " Homewood Hollow," May, 1896. 



HEUCHERA Linnaeus. 



* H. Americana Linnaeus. Alum-root. 



MITELLA Tournefort. 



* M. diphylla Linnaeus. Mitrewort. 



CHRYSOSPLENIUM Linnaeus. 



* C. Americanum Schweinitz. Water carpet. 



Harrison Township, borders of Little Bull Creek, May 3, 1893, 

 Dr. Adolph Koenig ; May, 1900, J. A. Shafer. 



HYDRANGEA Linn^us. 



* H. arborescens Linnaeus. Wild hydrangea. 



PHILADELPHUS Linnsus. 



* P. coronarius Linnaeus. Mock orange. 



Occasionally escaped from gardens. 



