YELLOWSTONE NATIONAL PARK 63 



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GUMWEED 



GROUNDSEL 



Gumweed (Grindelia). Gumweed is a fairly 

 common roadside plant growing in dry places at the 

 lower and middle altitudes ; it is a frequent associate 

 of the rabbit-brush. It branches freely into a low 

 bush, about a foot in height, the stems thickly cov- 

 ered, even up to the flower-heads, with many small, 

 round, rather broad-ended leaves. All green parts are 

 exceedingly sticky with a resinous, odorous gum. The 

 flowers are about an inch in diameter, with many yel- 

 low rays and yellow disk; they appear in August and 

 last until frost. 



Groundsel (Senecio). This is an exceedingly 

 abundant plant throughout the Park, in moist, open or 

 partly sheltered places. The stems are stiff and very 

 erect ; they branch freely, and reach a height of about 

 three feet. They are exceedingly leafy, and the leaves 

 are long and narrowly lance-shaped, with sharply 

 toothed margins. The blossoms are very numerous; 

 they are small, about half an inch long and a quarter 

 of an inch in diameter, bright yellow in color. They 

 come into bloom in late June or early July and last 

 until about the end of August. 



