140 SELECTED WESTERN FLORA 



tube 5-toothed; style exserted, the branches long and thread-like; 

 aohenes generally more or less hairy; pappus of numerous bristles. 

 Low leafy shrubs with alternate linear leaves and small heads of 

 yellow flowers in a corymb-like cluster. 



1. B. graveolens, Gray. 



Stem 1-3 ft. high, diffusely branched and very leafy; leaves narrowly 

 linear; heads numerous, the bracts of the involucre usually in 4 rows; 

 pappus of numerous soft bristles. Dry alkaline soil, S. W. Sask. and S. Alta. 



7. GUTIERREZIA. 



Heads radiate, few-flowered; rays 1-6, pistillate; disk flowers 

 mostly perfect; bracts of the involucre leathery with green tips; 

 pappus of a few chaffy scales. Erect, branching, glabrous herbs 

 with linear entire leaves and small heads of yellow flowers. 



1. G. SarothrsB, (Pursh.) Britton and Rusby. 



Low, 4-10 in. high, slender, diffuse, and very leafy, sometimes growing 

 in dense patches; the heads crowded at the ends of the ascending branches, 

 (ff. Euthamice, T. and G.). Dry prairies, Man. -Alta. 



8. GRINDfeLIA. Gum-weed. 



Heads many-flowered; rays, when present, fertile; pappus 2-8 

 deciduous awns or bristles ; involucre of several rows of overlapping 

 green bracts, usually with pointed, more or less spreading tips. 

 Coarse perennial herbs with sessile or clasping leaves, and large 

 heads of yellow flowers. 



1. G. squarrdsa, (Pursh.) Dunal. 



Leaves oblong to spatulate; involucre sticky, the bracts hooked at the 

 tips. Gravelly banks, Man.-Alta., July to Oct. 



9. SOLIDAGO. GoLDENROD. 



Ray and disk flowers both presi^nt ; rays in one row, fertile ; disk 

 flowers usually perfect, 5-toothed; pappus of numerous rough hair- 

 like bristles in 1 or 2 rows; heads small, few-flowered, arranged in 

 terminal or axillary clusters. Erect perennial herbs with usually 

 simple stems, alternate simple leaves, and showy, often conical 

 clusters of yellow flowers. 



