[From the Bullbtin op the Torrey Botanical Club 39: 99-111. 17 Ap 1912 J 



Studies on the Rocky Mountain flora — XXVI 



Per Axel Rydberg 



PINACEAE and JUNIPERACEAE 



In the New Manual of Botany of the Central Rocky Mountains 

 no reference is made to Picea canadensis, although it has been col- 

 lected in the Black Hills of South Dakota and Wyoming. Blankin- 

 ship in his supplement to the Flora of Montana,* reports P. alba, 

 which is the same, from four localities in Montana. This, however, I 

 think is erroneous. All specimens from Alberta, British Columbia, 

 and Montana, that I have seen determined as P. canadensis or P. 

 alba, belong to P. albertiana S. Brown. Probably the specimens 

 reported by Blankinship belong there also. Abies grandis is also 

 omitted in the New Manual. This is not uncommon in Montana 

 west of the continental divide. Perhaps that part of the state 

 is not intended to be included in the range covered by the New 

 Manual, as it includes only "most of Montana." The species has 

 been reported from the Yellowstone Park, but the reference is un- 

 certain. Blankinship, loc. cit., also reports Juniperus virginiana 

 from Montana and cites three localities. I have no evidence that 

 the determinations were correct nor have I seen any specimens 

 from the state. What makes me more doubtful as to the correct- 

 ness of the determination is that two of the localities are situated 

 west of the continental divide, and at Bozeman, the third locality, 

 I have myself collected during parts of three summers and have 

 not seen it. 



I doubt very much if Juniperus Knightii A. Nelson can be 

 upheld as a species distinct from /. utahensis (Engelm.) Lemmon. 

 The characters given, apparently do not hold. The leaves are 

 supposed to be 2-ranked in /. monosperma and /. utahensis and 

 3-ranked in /. Knightii. I know that in the first two they are 

 both 2- and 3-ranked. I have not seen the type of /. Knightii, 

 but in a specimen distributed under that name by Professor Nelson 



* Montana Agr. Coll. Sci. Stud. Bot. i: 39. 1905. 



99 



