SAXIFRAGACEAE 355 



2. M. nuda L. In cold woods and peat bogs: Labrador to Newf. 

 and Br. Col., south to Pa. and Mont.; also in eastern Asia. 

 Conn. The higher elevations of northwestern Litchfield Co. 

 Pa. The mountains of Wayne and Monroe counties. 



Tertiary, o: Cretaceous, o: Older Formations, rare and local at 

 high elevations. Not south of the moraine. 117-138 days. 

 1,070-4,000 ft. 



The reported occurrence of M. prostrata Michx., at New Milford, Conn., is doubtful. 

 The report is probably referable to a mere form of M. nuda or of M. diphylla. 



3. Heuchera L. 

 1. H. americana L. In dry and rocky woods: Conn, to Ont. and 

 Minn., south to Ala. and La. 



Throughout the area except the pine-barrens of N. J. and L. I., 

 there rare or wanting; rare in the area surrounding the pine-barrens,, 

 always increasing northward. 



4. Tiarella L. 



1. T. cordifolia L. In rich moist woods: N. S. to Minn., south 

 to Ga. and Ala. 

 Conn. Rare and local in most parts of the state, especially near 



the coast; increasing and becoming common northwestward. 

 N. Y. Reported but not definitely known from Westchester Co., 



thence increasing and common northward. 

 N. J. Passaic, Morris, and Sussex counties, increasing northward. 

 Pa. Pike, Wayne, Monroe, Luzerne, Lehigh and Delaware 



counties. 



Tertiary, o: Cretaceous, o: Older Formations, increasing north- 

 ward. South of the moraine only in Pa. 117-220 days. Sea level 

 -3,800 ft. 



5. Micranthes Haw. 



Filaments subulate or filiform-subulate. 



Cymules compact or closely corymb-like at maturity. 1. M. pennsylvanica. 



Cymules open and often raceme-like at maturity. 2. M. virginiensis. 



Filaments clavate or spatulate. 3. M. micranthidifolia. 



i. M. pennsylvanica (L.) Haw. (Saxifraga pennsylvanica L.). 

 In swamps and on wet banks: Me. and Ont. to Minn., Va. 

 and Mo. 



Throughout the range, except in the pine-barrens of N. J. and 

 L. I., there rare or wanting. 



