100 MONTANA AGRICULTURAL COLLEGE SCIENCE STUDIES. 



A. foliacea humilis, Rydberg, is A. arida hinnilis, E. Nelson, 1. c. 



Antennaria Howellii, Greene Pittonia, 3: 174. "Montana", 

 IL Nelson, Proc. U. S. Nat. Mus. 23: 713; Columbia Falls, June 8, 

 1894, R. S. Williams, 1019; Thompson Falls, June 7, 1902. 



A. nardina, Greene, Pittonia, 4:82; A. corymbosa, E. Nelson, 1. c. 



Antennaria oblancifolia, E. Nelson, Bot. Gaz. 30:121. Br.idger 

 Mts., June 26, 1899. 



Antennaria oxyphylla, Greene, Pittonia, 4: 284; A. foliacea, Ryd- 

 berg, Flora, 413. "Spanish Basin, Gallatin Co., Rydberg & Bessey, 

 No. 5148". 



Antennaria pulvinata, Greene, Pittonia, 3: 287; A. media, Ryd- 

 berg, Flora, 410, in part at least. Tiger Butte, 1887, R. S. Williams, 

 729, as cited by E. Nelson, Proc. U. S. Nat. Mus. 23 : 702. 



Antennaria pulvinata albescens, E. Nelson, Proc. U. S. Nat. Mus. 

 23:702. Bridger Mts., June 18, 1897, Rydberg & Bessey, 5162, 

 as quoted. 



Aplopappus Andersonii, (Rydb.) ; Stcnotus Andersonii, Rydberg, 

 Bull. Torr. Bot. Club, 27:615. "Belt Mts., 1886, F. W. Anderson". 



Aplopappus integrifolius pumilus, ( Rydberg) ; Pyrrocoma intcg- 

 ri folia pumila, Rydberg, Bull. Torr. Bot. Club, 27:626; P. Hoivcllii, 

 Rydberg, Flora, 382. "Butte, 1895, Rydberg". 



Aplopappus rigidus, (Rydberg) ; Pyrrocoma rigida, Rydberg, 

 Bull. Torr. Bot. Club, 27, 624. Separated from A. carthamoides, 

 Gray. "Columbia Falls, 1894, R. S. Williams". 



*Arctium Lappa, L. The burdock is not rare as a weed in a 

 few localities. Big Timber, July u, 1901; Libby Creek, July 26, 

 1900. 



*Artemisia annua, L. An introduced weed in waste places at 

 Billings, Aug. .29, 1904. 



Aster angustus, Torr. & Gray; Brachyactis angnstns, Britton. 

 Frequent in alkali soil. 



Great Falls, Sept. 16, 1886, R. S. Williams; Havre, Sept. 15, 1900; 

 Chinook, Sept. 10, 1900; Malta, Sept. 9, 1900; Columbia Falls, Sept. 

 17, 1894, R. S. W T illiams; Custer Station, Aug. 24, 1890. 



Aster crassulus, Rydberg, Bull. Torr. Bot. Club, 28 : 504. 



