MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. II 



It has been reported for Montana, but no specimens have been 

 seen by me. It is^ fairly common in the Yellowstone Park at an 

 altitude of about 2000 m. 



Yellowstone Park: East DeLacy's Creek, Aug. 10, 1897, 

 Rvdbej'g ct- Bessey, Jjji. 



Picea Engelmannli Parry ; Engelm. Trans. Acad. St. Louis, 2: 212 



[Man. R. M. 431]. 



This is the most common spruce in Montana and the Park, grow- 

 ing together with the Lodge Pole Pine and the Douglas Spruce in 

 richer woods, at an altitude of 1000 to 2500 m. 



Montana: Rea Mountains, Sept., 1884,,/. S. Nezvherry (with 

 narrow rhomboid scales) ; Emigrant Gulch, Aug. 23, 1897, Ryd- 

 berg d~ Bessey, J jjj ; Electric Peak, Aug. 20, jjj2; Madison Co., 

 18865 Tzueedy ; Virginia City, 1886, Tweedy. 



Yellowstone Park: East DeLacy's Creek, Aug. 10, 1897, 

 Rydbe?'g cC- Bessey, Jjjo ; Upper Geyser Basin, Aug. 8, Jj2p. 



*Picea Columbiana Lemmon, Gard. & Forest 10: 183. 



A pyramidal tree, 20-30 m. high with grayisli bark ; on the stem 

 and older branches, yellowish or brownish on last year's branches, 

 and light 3'ellow on those of the season ; branches and sterigmata 

 perfectly glabrous and shining ; the free portion of the latter about 

 I mm. long and with small auricles at the base ; leaves 1-2 cm. long, 

 glaucous green, short-acute, carinate and 2-grooved on both sur- 

 faces, the carina of the upper surface slightly stronger ; the cross- 

 section is therefore somewhat irregularly rhomboid ; fertile cones 

 about 3 cm. long and 2 cm. in diameter, ellipsoid; scales broadly 

 obovate, 1-1.5 cm. long and about i cm. wide, rounded at apex and 

 irregularly erose. 



In central Montana it is known as White Spruce, but it is plainly 

 distinct from the White Spruce of eastern United States. Although 

 the general habit and the color of the foliage are the same and the 

 branches are perfectly glabrous in both, there is a striking difference in 

 the form of the cones and the leaves. In B. Canadensis the cones 

 are almost cylindrical ; in B. 'CoIiDnhiaua decidedly ellipsoid. In the 

 former the scales are very concave and the margin almost entire ; 

 in the latter, the scales are strongly erose as in B. E)igelniannii. In 

 B. Colanihiaiia the leaves are much more short pointed than in B. 

 Canadensis. B. Columbiana is far more nearly related to B. En- 

 gelniannii, from which it differs only in the perfectly glabrous 

 branches and sterigmata and in the less rhomboid scales of the cones. 



