34 MINNESOTA STUDIES IN PLANT SCIENCE 



(MBG 84360) ; banks of the Conestoga, May 1, 1895, Chas. W. Eisenhour (MBG 

 84362) ; Philadelphia, Beynick (MBG 84355) ; Quakertown, May 12, 1907, Ethel Knight 

 Ball (MBG 83940). 



Maine : rocky ground. Seal Harbor, Mt. Desert, June 27, 1890, Redfield herbarium 

 16492 (MBG 84356) ; exposed rocks, Orono, May 23, 1888, M. L. Fernald (UMH) ; 

 Orono, May, 1893, F. P. Briggs (UMH). 



New Hampshire: Hanover, May 5, 1883, C. H. Hitchcock (UMH). 



Massachusetts : Amherst, May, 1890 and May, 1889, E. L. Morris (UMH) ; 

 South Warmingham, 1890 (MBG 84369) ; Stony Brook, May 15, 1897, /. M. Green- 

 man, No. 629 (MBG 738779) ; West Roxbury, May 13, 1898, /. M. Greenman, No. 

 2950 (MBG 742616) ; Middlesex, Pels, April 19, 1898, /. M. Greenman, No. 569 

 (MBG 738766) ; Winchester, May 9, 1897, /. M. Greenman, No. 636 (MBG 738957) ; 

 Nonquit, E. P. (MBG 84367) ; Nonquit, May 1, 1889, E. P. No. 849 (UMH) ; dry 

 rocky banks, Lexington, Day and Fernald (MBG 84372) ; Arlington, May 3, 1891, 

 E. W. Dewart (MBG 84370) ; Nonquit, May 7, 1889, Miss Croll (MBG 84368). 



Connecticut: Storrs, March, 1907, W. W. Ohlweiler (MBG 792271); rocky 

 woods, Southington, May 23, 1897, C. H. Bissell, Nos. 272 and 813 (MBG 84364). 



New Jersey: Woodbridge, May, 1893, Rev. L. H. Lighthipe (UMH) ; Peapack, 

 April, R. C. Perry No. 50 (MBG 84562) ; Peapack, R. C. Perry (MBG 84564) ; 

 rocky banks, Greenwood Lake, Passaic County, May 19, 1907, Kenneth MacKemie, No. 

 2560 (MBG 84584). 



Section Chionophila, sect. nov. 



Micranthes, Haw., Syn. PI. Succ. 1812; in part. 

 Arabidia, Ledebour, Fl. Ross., 2. 1844; in part. 

 Boraphila, Engler, Verb. Zool.-Bot. Ver., Wien. 1869; in part. 



Receptacle deeply adnate to tbe ovary; follicles elliptic-ovate, more or 

 less inflated, conspicuously contracted above; styles more or less elongate, 

 often stout; stigmas globose or discoid; gland discoid; the lower margin 

 closely approximated to the base of the calyx; filaments subulate, incurved 

 toward the apex ; anthers oblong ; sepals spreading ; seeds narrowly ovate, 

 slightly winged on the margin, and more or less striate. 



The most conspicuous characters of this section are the deep campanulate 

 receptacle and the discoid gland which lies close to the base of the calyx. 

 The receptacle attains the greatest depth in Saxifraga rhomhoidea, enclos- 

 ing the carpels for half their length. It is shallowest in S. franciscana. As 

 development proceeds the gland assumes a verrucose appearance and sur- 

 rounds the carpels as a broad zone immediately above the base of the calyx. 

 As a rule the beaks are stout, except in .5". franciscana where they are quite 

 slender and also strongly bent at right angles or even recurved (Plates 

 II, III, XI). 



The section embraces only three species, which, in their distribution, are 

 plants of high altitudes and of far northern latitudes. S. hieracifoUa is 

 circumpolar in range, having its type locality in the Carpathian Moun- 

 tains of Hungary. The specimens examined are from scattering stations 



