76 BULLETIISr 791, U. S. DEPARTMENT OF AGRICULTURE. 



Riibberweed (Ili/meno-njs floi-ihiiiicla). 



Sampson's mertensia {Mertensm sampsonii). 



Scribuer's wheat grass (Agropyron scribneri). 



Snowy onion grass (Melica spectahilis). 



Sneeze weed (Helenium lioopesii). 



Tongue-leaved violet {Viola linyuaefoUa), 

 Ruderal-early-weed cover (first-weed stage) : 

 Primary species — 



Douglas knotweed {Polygonmn douglasii) . 



Goosefoot or lamb's-quarters (ChenopocUum album). 



Slender-leaved collomia (Colloinia linearis). 



Tarweed (Madia glomerata). 



Tansy mustard (Sophia incisa). 



Tolmie's ortliocarpus (Orthocarpus tolmiei). 

 Secondary species — 



Androsace (Atidrosace diffusa). 



Gilia (Gilia mierantJia). 



Knotweed (Poli/gonum avimilai-e) . 



Monolepis (ilonolepis mittalHana) . 



Peppergrass (Lepidiuni ramossissimum) . 



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