238 Karl M. Wiegand and Arthur J. Eames 



2. S. virginiensis Michx. Early Rock Saxifrage. 



On rocky banks and dry ledges in ravines, on noncalcareous sandstone, gravels, 

 and clayey gravels ; common. Apr -May. 



Rare in the McLean district and in the chestnut soils of the southern hills of the 

 basin ; common about the ravines and on the eastern slope of Cayuga Lake. 



N. B. to Minn., southw. to Ga., Tenn., and Mo. ; less frequent on the Coastal Plain. 



3. S. aizoides L. Yellow Mountain Saxifrage. 



Shaded dripping calcareous cliffs; very rare. June 15-30. 



"Cliffs of Taughannock ravine, south side, below the falls ; detected Oct. 1880 " 

 (D.). Elsewhere in X. Y. only at Fish Creek, Oneida Co. (Knieskem & Vasey, 

 House), Salmon River, Oswego Co., 1893 (W. W. Rozvlee\), Portage (Day), and in 

 Warsaw Glen, 1871 (Dr. Jordan, D.). 



Newf. and Lab. to B. C, southw. to Vt., N. Y., and Mich. Found also in arctic 

 and alpine Eurasia. 



This is one of three rare northern plants finding their southern limits on the shaded 

 dripping rocks in the ravines of central New York. The other members of the group 

 are Primula niistassinica and PinguicuJa vulgaris. 



2. Tiarella L. 

 1. T. cordifolia L. False Miterwort. 



Dry or damp woodlands in humus, usually over gravelly or rocky, more or less 

 calcareous, soils ; common. May-June. 



N. S. and N. B. to Minn., southw. in w. N. E. to Conn., to N. Y. and Ind., and 

 in the mts. to Ga. ; rare or absent on the Coastal Plain. 



Two forms occur, one with salmon-pink, the other with light yellow, anthers. 

 These are about equally common. 



3. Mitella (Tourn.) L. 



a. Stem bearing 2 opposite, nearly sessile, leaves; lobes of the leaves acute; flowers 

 white; calyx cup-shaped. 1. M. dipJiylla 



a. Stem naked, rarely with 1 or 2 leaves ; leaves obtuse, scarcely lobed ; flowers 

 greenish; calyx saucer-shaped; petals with more filiform divisions. 



2. M. nuda 



1. M. diphylla L. Miterwort. Bishop's Cap. 



Ravines and damp thickets, in rich loamy or gravelly, more or less calcareous, 

 soils with humus ; common. May. 



Absent on the acid sandy or gravelly soils and on the clays of the basin, other- 

 wise general. 



Que. to Minn., southw. to N. C, Mo., and Iowa; rare or absent in most of granitic 

 N. E. and on the Coastal Plain. 



2. M. nuda L. 



Boggy woodlands in moss in calcareous regions ; frequent. May 10-June 15. 



W. of Key Hill; Michigan Hollow Swamp (D. !) ; swamp e. of Slaterville; Ellis 

 Hollow Swamp (D.\) ; Bear Swamp (D.) : Fir Tree Swamp, Freeville (D.) ; Mud 

 Creek, Freeville (D. !) ; Malloryville Bog (D.) ; McLean Bogs (D.) ; Beaver Brook; 

 arbor vitae swamp e. of Clyde ; abundant in arbor vitae swamp w. of Turtle Pond. 



Lab. to Alaska, southw. to Conn., Pa.. Mich., Minn., and Mont. 



4. Chrysosplenium (Tourn.) L. 

 1. C. americanum Schwein. Golden Saxifrage. 



Wet mucky woodlands, usually in cold springs, apparently in both calcareous and 

 noncalcareous waters ; frequent. Apr.-May. 



