RUBBER RABBITBRUSH 



Chrysotham'nus nauseo'sus 



Flower heads small, narrowly coue- 

 shaped, 4- to 6-flowered, clustered at 

 ends of sterna 



Flowers of the heady-small, yellow, 

 tubular, cobwebby-hairy, sharply 5- 

 toothed, perfect, seed-producing; outer 

 (ray) flowers of head lacking 



Bracts in a series (involucre) around 

 base of flower head, somewhat pointed 

 at tips, keeled, dry, firm, arranged in up 

 to 5 vertical rows; lowest row some- 

 times white-woolly 



Leaves alternate, narrow-linear, 1 to 

 3 in. long, less than % in. wide, entire on 

 margins, not gland-dotted, covered by a 

 close fine felt of hairs when young 



Stems woody, erect, branched above 

 but not widely spreading, commonly 

 white and felty 



Pollen-receiving organ (stigma) longer 

 than anther tube, 2-branched; branches 

 tapering, bristly, not widely spreading 



Stamens 5, united by their pollen sacs 

 (anthers) into a tube extending beyond 

 united petals 



"Seed" (achene) angled, hairy, 

 crowned by a ring of straight, soft, 

 white hairs (pappus) nearly as long as 

 corolla tube 



