464 Rydberg: Studies on the Rocky Mountain flora 



leaves oblanceolate ; stem-leaves linear or linear-lanceolate, 

 about 2 cm., acute; flowers 1-3 in the axils; pedicels 2-8 mm. 

 long; calyx-tube about 2 mm. long; lobes linear-lanceolate, 3-5 

 mm. long, acute, scabrous on the margins; corolla about 5 mm. 

 long; lobes ovate, obtuse or acute; crown none. 



This little Amarella lacks the setaceous fimbriate crown at the 

 base of the corolla-lobes and therefore should be classified with 

 the arctic or subarctic A. propinqua (Richards.) Greene, and A. 

 arctophila (Griseb.) Greene, but the corolla-lobes are acute or 

 obtuse, instead of cuspidate. 



Wyoming: Wind River Moutainns, Aug. 4, 1843, Fremont. 



Dasystephana oregana (Engelm.) Rydb. 

 Gentiana oregana Engelm.; A. Gray, Syn. Fl. 2^: 122. 1878. 



Dasystephana glauca (Pall.) Rydb. 

 Gentiana glauca Pall. Fl. Ross. 2: 104. 1784. 



Dasystephana calycosa (Griseb.) Rydb. 

 Gentiana calycosa Griseb. Gen. et Sp. Gent. 292. 1839. 



Dasystephana monticola Rydb. sp. no\'. 



Gentiana calycosa stricta Griseb. Gen. et Sp. Gent. 292. 1839. 



Gentiana calycosa monticola Rydb. Bull. Torrey Club 24: 252. 



1897. 



Dasystephana obtusiloba Rydb. sp. nov. 



Cespitose perennial; stems erect or ascending, about i dm. 

 high; internodes short, equaling or a little longer than the leaves; 

 leaves very broadly ovate, 3-5-ribbed, usually acute at the apex 

 and subcordate at the base; calyx-tube broadly turbinate, 5-6 

 mm. long; lobes broadly oval, rounded at the apex, often over- 

 lapping, about 8 mm. long; corolla dark blue, about 3.5 cm. long; 

 lobes rounded at the apex; lobes of the plaits about half as long 

 as the corolla lobes. 



This is related to D. calycosa, but differs in the lower habit and 

 rounded corolla-lobes. 



Montana: Mary Baker Lake and Sperry Glacier, Aug. 21, 

 1901, Vreeland 1162 (type, in herb. N. Y. Bot. Gard.); Lake 

 MacDonald, Aug. 22, 1901, Umbach jyi; Mount MacDonald, 

 July 25, 1900, Elrod & assistants; Silloway Peak, July 17-19, 

 1901, MacDougal 6g2; Blackfoot Indian Reservation, Aug. and 

 Sept. 1909, Gilman Thompson. 



