12 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



It may be only a form of that species. P. Canadensis has been re- 

 ported from Montana several times but I doubt its occurrence there. 

 Probably P. Columbiana has been mistaken for it. The latter 

 arrows in the canons of the mountains of central and southern Mon 

 tana at an altitude of about 2000 m. 



Montana: Jack Creek, Jul}^ 15, 1897, Pydbcrg d- Bcsscy^ jjj^; 

 Emigrant Gulch, August 23, 1897, JjJJ- 



Pseudotsuga mucronata (Raf.) Sudworth, Cont. U. S. Nat. Herb. 

 3: 266; Abies niiicrouata Raf., Atl. Journ. 120; Finns taxifolia 

 Lambert, Pinus, Ed. i: 51. 1803; not Salisb. 1796; Abies 

 Douglasii Lindl. in Penn. Cvcl. 1:32; Pseudotsuga Douglasii 

 (Lindl.) Carr. Trait. Con., >:ouv. Ed. 256 [Man. R. M. 431; 

 Bot. Cal. 2 : 120]. 



The Douglas Spruce or Red Fir is the most valuable lumber tree 

 in western Montana. It is common in the mountain regions from 

 the Big Snowies westward, and ascends to an altitude of 2500 m. 



Montana: Spanish Basin, June 26, 1897, Rydberg ti' Pessey, 

 ^54-0; Electric Peak, August 18, jjj/ and JjjS ; Bozeman, 1892, 

 W. T. Shaw ; Great Falls, 1889, R. S. Williams^ yjj. 

 Yellowstone Park : Tzceedv; Rydberg d- Pessev. 



* Abies grandis Lindl., in Penn. Cycl. i: 30 [Bot. Cal. 2: 118] : 



Abies aroniatiea Raf. in Atl. Journ. 119, 1832 (?). 



Bark thin, finely checked, and dingy white although quite dark 

 on the surface; cones narrow, 5-7.5 cm. long; male flowers yellow. 



Yellowstone Park: Upper Geyser Basin, Aug. 8, 1897, Ryd- 

 berg & Pessey, JS3S i Columbia Falls, 1892, R. S. Williams^ gio. 



Idaho : (near the border) Isabel JMuIford. 



* Abies amabilis (Loud.) Forb. Pinetum Wob., 12$, f I. 44.; Pinus 

 grandis Lamb., Pinus, Ed. i, 3: pi. 26, 1837, not Lindl. ; Pieea 

 amabilis Loud. Arb. Frut. 4: 2342, /". 224'j-8, 1838. 



It is characterized by its reddish bark, crimson male flowers, 

 cones 7.5-10 cm. long, leaves not twisted. 



Abies lasiocarpa ( Hook. ) Nutt. Sylva 3 : 138 ; Pinus lasioearpa 

 Hook Fl. Bor. Am. 2 : 163 ; Abies subaJpina Engelm. ; Ward, in 

 Amer. Nat. 10: 555 [Man. R. M. 430]. 

 It is a rather rare tree growing near the timber line on the higher 



mountains, generally among rocks, at an altitude of 2000 m. or more. 



As a rule it is a low and stunted tree. 



