354 SAXIFRAGACEAE 



SAXIFRAGACEAE 



Placentae parietal, sometimes nearly basal. 



Flowers solitary and axillary, or in small corymbs. I . Chry sosplenium. 



Flowers in more or less elongated racemes or panicles. 

 Gynoecium of 2-3 equal or essentially equal carpels. 



Inflorescence racemose. 2. Mitella. 



Inflorescence paniculate. 3. Heuchera. 



Gynoecium of 2 very unequal carpels. 4. Tiarella. 



Placentae axial. 5. Micranthes. 



i. Chrysosplenium [Tourn.] L. (see pi. 8) 

 I. C. americanum Schwein. In wet shaded places: N. S. to 



Sask., south to Ga. and Minn. 



Conn. Throughout the state. 



N. Y. Not rare on the south side of L. I., not common on the 

 north side and on S. I., thence increasing and common north- 

 ward. 



N.J. Unknown in the pine-barrens, very rare in the region west of 

 them, thence increasing and common northward. 



Pa. Throughout the area, very common northward. 



Tertiary, not on Beacon Hill, rare elsewhere: Cretaceous, 



scattered: Older Formations, increasing northward. 117-207 days. 



Sea level-3,970 ft. 



2. Mitella [Tourn.] L. 



Stem leaves opposite. I. M. dipkylla. 



Ftem leaves usually wanting, if present, alternate. 2. M. nuda. 



i. M. diphylla L. In rich woods: Que. to Minn., south to N. C. 

 and Mo. 



Conn. Throughout, but not reported from New London Co., 



increasing northwestward. 

 N. Y. Reported from but doubtfully on L. I., rare on S. I. and in 

 Bronx and Westchester counties, thence increasing and becom- 

 ing common northward. 

 N. J. New Egypt, Ocean Co.,* unknown between this locality 

 and Hunterdon, Union and Somerset counties, thence increasing 

 and common northward. 

 Pa. Throughout the area, increasing northward. 



Tertiary, a single, remarkable station just on the edge of Beacon 

 Hill: Cretaceous, o: Older Formations, increasing northward. Pre- 

 dominating north of the moraine. 117-220 days. Sea level- 

 4,020 ft. 



* See Introduction paragraph 36. 



