1G THE MONTANA EXPERIMENT STATION. 



A. retroflexus, L "Careless Weed." Common in gardens and 



rich soil. 



A. chlorostachys, Willd Much less frequent; confused with the last. 



Artemisia biennis, Willd "Wormwood." Frequent in many places. 



Capsella Bursa-pastoris, Moench "Shepherd's Purse." Common in gardens. 



Chenopodium album, L "Pigweed." Common in cultivated ground. 



C. glaucum, L A weed not infrequent in gardens. 



Cnicus undulatus, Graj- "Thistle." 



Draba nemorosa, L Common. 



Erigeron Canadensis, L "Ragweed." frequent. 



Helianthus annuus, L "Sunflower." One of the worst weeds in the 



state. 



Iva xanthiifolia, Nutt "Horseweed." Common east of the Divide. 



Lepidium apetalum, Willd " Birdseed. ' ' 



Monolepis chenopodioides, Moq "Poverty Weed." 



Polygonum Convolvulus, L "Wild Buckwheat." 



Solanum rostratum, Dunal ' ' Buffalo-bit r. " 



Solanum triflorum, Nutt "Wild Potato." 



Sonchus asper, Vill "Sow Thistle." 



B. PERENNIALS. 



Artemisia Ludoviciana, Nutt "White Sage." 



Cnicus arvensis, Hoffm "Canada Thistle." 



Epilobium augustifolium, L "Iron-weed." In mountain regions. 



Glycyrrhiza lepidota, Pursh "Wild Liquorice." In low ground. 



Lactuca pulchella, DC "Milk- weed." 



Lupinus sericeus, Pursh "Lupine." Persistent in new ground. 



L. pusillus, Pursh , "Little Lupine." Root tuberous. 



Lygodesmia juncea, Don "Wild-asparagus." Plains. 



IV. Weeds of the Grain-Fields.— Mostly annuals fruiting 

 at the same time as the grain; the thistle is a biennial and sheep- 

 sorrel and Gaura are perennial with creeping root-stocks. These 

 from their size, rapidity of growth, or undue multiplication tend 

 to choke out the grain in which they grow and are difficult to 

 repress on account of the iact that, after seeding, about the only 

 way to get at them is by hand-pulling, a slow and expensive 

 process. 



Avena fatua, L "Wild Oats."' Common all over the state. 



Brassica Sinapistrum, Boiss "Wild Mustard." Very bad in many locali- 

 ties. 



Bromus secalinus, L ...."Cheat." Troublesome in some places. 



Camclina sativa, Crantz "False Flax." 



Cleome integrifolia, Torr. & Gray "Indian Pink." 



