189 



Dry Mountains, near Lima, P. A. Rydberg, no. 2600, Aug. 5, 

 1895. 



It is apparently nearest related tcr C. Nuttallii, from which it 

 differs by the longer sepals, longer and tapering anthers and the 

 acuminate petals. 



Habenaria DiLATATiFORMis. {Plateiitliera gracilis Lindl. Gen. & Sp. 



Orch. 288. 1835-9. Habenaria gracilis S. Wats. Proc. Am. 



Acad. 12: 277. 1877. Not Hook. Exot. Y\. pi. ij^. 1825.) 



In general habit this most resembles H. hyperborea, from 

 which it differs in the larger white flowers, in the lip, which is 

 broadened at the base as in H. dilatata, although less so, and in 

 the spur which is thickened at the end. From H. dilatata it 

 differs in the less dilated lip and the shorter more saccate spur, 

 which is slightly shorter than the lip. 



Common in marshy places at an altitude of 5000-6000 feet. 

 Spanish Basin by J. H. Flodman (nos. 360 and 361) ; also collected 

 by P. A. Rydberg, in 1895, at Bozeman (no. 2607), and at Deer 

 Lodge (no. 2608). 



Habknaria stricta (Lindl.). Platentera stricta Lindl. Gen. & Sp. 



Orch. 288. 1835-9. 



This differs from the preceding in the greenish or purplish 

 flowers, the narrower lip and the very short and much more sac- 

 cate spur, which is scarcely more than one-half as long as the lip. 

 Habenaria saccata Greene, Erythea, 3: 49, 1895, seems, from the 

 description, to be the same. It is fairly common in swampy 

 places of central Montana. Spanish Basin, collected by J. H. 

 Flodman (no. 362), and by myself in 1895, near Mystic Lake, no. 

 2609. 



Alnus sinuata (E. Regel). 



Alnus viridis /5 Hook. Fl. Bor. Am. 2 : 157. 1837. 



Alnus viridis sinuata E. Regel in DC. Prod. 16: Part 2, 183. 



1868. 



Shrub 1-5 m. high ; young bark brown and glossy with scat- 

 tered white lenticles : older bark grayish ; leaves 3-10 cm. long, 

 oval, acute or acuminate at both ends, sinuately lobed and doubly 

 and sharply serrate, thin, green and glabrous on both sides, very 

 glutinous when young, in age shining ; peduncles racemiform, very 



