MEMOIRS OF THE XEM' YORK BOTANICAL GARDEN. II 7 



Alnus tenuifolia Nutt. Sylva, i : 32 ; Alniis incana glauca Regel. ; 



Nouv. Mem. Soc. Nat. Mosc. 13: 154, in part; Almis incana 



virescens\N2i\.s. Bot. Cal. 2: 81 [Man. R. M. 332J. 



It grows along streams in the mountain regions, at an altitude of 

 1000-2000 m. 



Montana: Melrose, 1895, Rydherg, 261 1 ; Spanish Basin, June 

 23 and 28, 1897, Rydberg <£- Bessey, J^Ji, 3932; Indian Creek, 

 July 21, 1897, 3930; Lewis and Clarke Co., J/r5. J/z^//^; Mullen 

 Pass, 1882, Tweedy; West Boulder, 1887, 296; Bozeman, 1886, 

 ii8j ; Fort Logan, 1882, Canby \ Red Lodge, 1898, Williams & 

 Griffith. 



* Alnus sinuata (E. Regel) Rydb. Bull. Torr. Bot. Club, 24 : 189 ; 



Alnus viridis sinuata E. Regel; DC. Prod. 16: part 2, 183. 



Differs from A. Alnobetula in the thinner more shining leaves, 

 which are more or less sinuately lobed and perfectly glabrous. It is 

 common along streams, at an altitude of 2000-3000 m. 



Montana: Spanish Basin, July 10, 1896, Flodnian, 369: Emi- 

 grant Gulch, Aug. 23, 1897, Rydberg & Bessey^ 3933 and 3934; 

 Bozeman, 1885, Tzvecdy, 438 ; Granite, 1892, AW5^_)'; Jocko River, 

 1883, Canby, 282. 

 Alnus Alnobetula (Ehrh.) K. Koch, Dend. 2: part i, 625 ; Belnla 



Alnobetula Ehrh. Beit. 2: 72 [111. Fl. i: 512]; Betula viridis 



Chaix; Vill. Hist. PI. Dauph. 3: 789; Ahms viridis DC. Fl. 



Fran. 3: 304 [Man. R. M. 332]. 



It is rare in Montana, growing along streams, at an altitude of 

 1500-2000 m. 



Montana: West Boulder, 1887, Tzueedy, 294. 



URTICACEAE. 

 Urtica gracilis Ait. Hort. Kew. 3: 341 [Man. R. M. 330; 111. Fl. 



i: 531]- 



Along streams and in waste places, up to an altitude of 2000 m. 



Montana: Jack Creek, July 15, 1897, Rydberg d- Bessey, 3936; 

 Emigrant Gulch, Aug. 23, 3933; Lima, 1895, Rydberg, 2613; 

 Gallatin River, 1886, Tweedy, 1093; Hilgris and Helena, 1892, 

 Kelsey ; Banks of Missouri River, 1883, Scribner, 230. 



Yellowstone Park: 1885, Tweedy, 444. 



* Urtica cardiophylla Rydb. Bull. Torr. Bot. Club, 24: 190. 



Like U. gracilis but with broad cordate leaves, short flower- 



