452 MEMOIRS OF THE NEW YORK BOTANICAL GARDEK. 



Ambrosia artemisiifoia L. Sp. PL 988 [111. Fl. 3: 295; Syn. Fl 



I-: 249: Bot. Cal. i: 344; Man. R. M. 180]. 



On prairies and in waste places, up to an altitude of 1500 m. 



Montana: Sand Coulee, 1885, R. S. Williams, 266. 

 Ambrosia psilostachya DC. Prod. 5: 526 [111. Fl. 3: 295: Syn. Fl. 



T^ : 250; Man. R. M. 181]. 



Prairies and river-valleys, up to an altitude of 1500 m. 



Montana : Billings, 1898, Williams & Grijith. 

 Gaertneria acanthicarpa (Hook.)Britt. Mem. Torr. Bot. Club, 5: 332 



[111. Fl. 3: 296]; Amb?'osia acant/u'ca?-pa Wook. Fl. Bor. Am. 



I : 309; Franseria Hooke^'iana Nutt. Trans. Am. Phil. Soc. (II.) 



7: 345 [Svn. Fl. I-: 250; Bot. Cal. i: 345: Man. R. M. 181]. 



In sand-draws, up to an altitude of 1500 m. 



Montana: Great Falls, 1891, R. S. Williams, 860; Billings, 

 1898, Williams & Griffith. 

 Xanthium Canadense Mill. Card. Diet. Ed. 8, no. 2 [111. Fl. 3: 298; 



Syn. Fl. I-: 252; Man. R. M. 182]. 



In waste places, up to an altitude of 1500 m. 



Montana: Big Timber, 1892, F. D. Kelsey ; Great Falls, 1885, 

 F. W. Anderson, 2jo; Billings, 1898, Williams (£: Griffith. 



CICHORIACEAE. 



Ptilocalais nutans (Geyer) Greene, Bull. Cal. Acad. 2 : 54 ; Scorzo- 

 nella nutans Geyer; Hook. Lond. Journ. Bot. 6: 253 : Microseris 

 nutans Sch. Bip. Pollichia, 22-24 • 3^8 [Bot. Cal. i : 423 ; Syn. 

 Fl. I-: 416; Man. R. M. 216]. 

 In wet meadows, up to an altitude of 2500 m. 

 Montana: Elliston, 1890, F. D. Kelsey; Lower Sand Coulee, 



1891, R. S. Williams, joi ; Deer Lodge, 1890, F. D. Kelsey; 

 Bridger Mts., June 14, 1897, Rydbcrg & Bessey, 52^1 ; Spanish 

 Basin, June 28, S-7-- 



Yellowstone Park: 1888, Dr. Chas. H. Hall; Mammoth Hot 

 Springs, 1885, Tivcedy, 6g8. 

 Nothocalais cuspidata (Pursh) Greene, Bull. Cal. Acad. (II.) 2: 



55 [111. Fl. 3: 278] ; Troximon ciispidatum'PxxYsh, Fl. Am. Sept. 



742 [Syn. Fl. 1-: 437: Man. R, M. 221]. 



On prairies, up to an altitude of 1500 m. 



Montana: Great Falls, 1886, R. S. Williams, j^; Custer Co., 



1892, Mrs. Light. 



