76 BULLETIN 791, U. S. DEPARTMENT OF AGRICULTURE. 
Rubberweed ( II ym en oxys fLorObun da ) . 
Sampson's mertensia (Mertensia sampsonii). 
Scribner's wheat grass (Agropyron scribneri). 
Snowy onion grass (Meliw. spectabUis). 
Sneezeweed (Helenium hoopesii). 
Tongue-leaved violet (Viola linguacfolia). 
Ruderal-early-weed cover (first- weed stage) : 
Primary species — ■ 
Douglas knot weed (Polygonum clouglasii). 
Goosefoot or lamb's-quarters (ChenopodMum album). 
Slender-leaved collomia (Collomia linearis). 
Tarweed (Madia glomerata). 
Tansy mustard (Sophia incisa). 
Tolmie's orthocarpus [Orthocarpus tolmici). 
Secondary species — 
Androsace (Androsace diffusa). 
Gilia (Gilia mierantlui). 
Knotweed (Polygonum aviculare). 
Monolepis (Monolepis nuttalliana) . 
Peppergrass (Lepidium ramossissimum) . 
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