WEEDS OF MONTANA. 49 



much resembling Chenopodium glaucum. One of our most troub- 

 lesome weeds in yards, gardens and waste places. 



88. "NASTURTIUM ARMORACIA, Fries. Horse Radish. 



In waste places an occasional escape from cultivation. 



89. *NEPETA CATARIA, L. Catnip. 



A well-known European perennial becoming established in 

 waste places at Helena (F. D. Kelsey), Columbia Falls, Holt, 

 Thompson Falls, Plains and a few other places in the state. 



90. (EXOTHERA BIENNIS, L. Yellow Evening Pkimkose. 



A slender biennial three or four feet high with yellow flowers 

 and spindle-shaped fruit about an inch long, introduced along the 

 railroads and highways in most parts of the state and frequently 

 so common as almost to appear native in low ground (O. depressa, 

 Greene and Onagra strigosa, Kydberg). 



91. PANICUM CAPILLARE, L. Tumble-Grass. 



A hairy annual grass with a widely spreading panicle of fruit 

 easily detached when ripe; occurs occasionally in fields and waste 

 places particularly in the Plains region. Here doubtfully native. 



92. *PANICUM CRUS-GALLI, L. Barnyard Grass. 



An introduced annual rare in fields, yards and waste places; 

 here usually prostrate and spread by irrigation. At Ulm (R. S. 

 Williams), Bozeman, Malta and Chinook. 



93. *PANICUM SANGUINALE, L. Crab-Grass. 



Occasionally imported from the east in grass seed, but shows 

 little or no disposition to spread. Noted at Great Falls and 

 Bozeman. 



94. PASTINACA SATIVA, L. Parsnip. 



Often escapes from cultivation and is found occasionally in old 

 fields, waste places and along irrigation ditches. 



95. PLAXTAGO ASIATICA, L. Native Plantain. 



The common plantain in ditches and low ground by roadsides 

 and in waste places, apparently native. 



