16 MINNESOTA STUDIES IN PLANT SCIENCE 



The very stout, deep purple follicles of this species are distinctive, differ- 

 ing markedly in this respect from the elongated, more slender follicles of 

 S. daviirica, besides, the blades of the leaves are more rounded toward the 

 apex and longer petioled than in that species, but the dentation is similar 

 (Plate IV). 



Distribution. — Unalaska, Alaska Peninsula, Pribiloff Islands, Hall Island, St. 

 Matthew Island, and probablj' along the Aleutian Islands. 



Specimens examined : 



Alaska: Herendeen Bay, The Albatross, 1890, W. H. Hall's exploration, U.S. 

 Coast Survey (USNH 423487) ; Herald Island, 1881, Capt. C. L. Hooper (USNH 

 423486, 423485) ; Popoff Island, Shumagin Islands, July 8 to 19, Harriman Alaska 

 expedition, Trevor Kincaid (USNH 375422) ; St. Paul Island, August 8, 1891, as 

 "Saxifraga unalaskensis" C. Hart Merriam (USNH 423484) ; Cold Bay, July, 1904, 

 C. V. Piper, No. 4276 (USNH 420728) ; Hall Island, Harriman Alaska expedition 

 as S. davurica Pall., July 14, 1899, Wm. Trelease, No. 4070 (MEG 83965) ; St Matthew 

 Island, Harriman Alaska expedition, July 15, 1899, Wm. Trelease, No. 4072 (MBG 

 83966) ; Popoff Island, Harriman Alaska expedition, July 18, 1£99, Be Alton Saunders, 

 No. 4069 (MBG 83968) ; St Paul Island, August, 1891, Jas. M. Macoun (MBG 83969). 



Section Calthophyllvim, ^ect. nu\-. 



Gymnopera D, Don, Monogr. Gen, Saxifr. in Trans. Linn. Soc. 13 :343. 

 1822 ; in part. 



Hydatica (Tausch) Seringe, DC. Prodr. 4:41. 1830; in part. 



Micranthes (Haw.) Small, N. Am. Fl. 22:2:146. 1905, as genus; in part. 



Boraphila (Engler) Rosendahl, Beibl. Bot. Jahrb. Nr. 83:71. 1905; in 

 part. 



Ovary free; carpels conical, slightly contracted and united at the base, 

 each surrounded below the middle by a dilated gland; follicles elliptic- 

 oblong, strongly contracted above and below; styles short and slender; 

 stigmas small ; filaments at first clavate, then greatly elongated and filiform ; 

 sepals reflexed (Plates I, V). 



Monotypic, including only the species described below. 



The carpels of this section are at first conical but soon become char- 

 acteristically bottle-shaped. They are united for a very short distance 

 from the base. In the mature follicles the united portion is represented 

 by the conspicuous constriction at the base. The receptacle is strongly con- 

 tracted at maturity so that the follicles are spread apart considerably. The 

 hypog\'ny is complete. The gland forms a broad girdle around each carpel, 

 extending from the middle to within a short distance of the base. It is only 

 slightly dilated and seems to disappear completely as the carpels develop. 



The section combines certain features of Dermasea and Hydatica. It 

 resembles Dermasea in the shape of the young carpels and to some extent 



