58 A Study of the Vegetation of 
yellow blossoms, their great numbers, often more than 100 indi- 
viduals in a square meter, give a distinct tone in contrast to the 
gray background of dead vegetation. 
Later on by the blossoming of Amelanchier, Crataegus, Prunus, 
and Rosa especially, the developmental shrub community be- 
comes very conspicuous. But the prairies become veritable 
flower gardens during the month of June. Then the large red 
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Fic. 15°. Hu, Heuchera glabella. A, Astragalus arrectus. S, Sidalcea 
oregana. H, Helianthella douglasti. Ag, Agropyron spicatum. 
blossoms of Geranium and Rosa mingle with the yellow of Poten- 
tilla, Gaillardia, Castilleja, and Helianthella. Senecio, Astragalus, 
Arnica, and societies of Wyethia brighten the landscape with their 
yellow blossoms, while the tall, widely spaced, sentinel-like plants 
of Cirsium foliosum with their showy red flowers add pleasing 
variety. 
Likewise the purple flowers of various lupines are conspicuous. 
Lupinus wyethi is only locally abundant. It is especially no- 
ticeable in the vernal aspect. It often covers areas of the driest 
hillsides and the whole aérial part dries up early. Lupinus or- 
natus iS very cosmopolitan over the high prairies and is an im- 
portant species. Lupinus sericeus is confined to the warmer 
58 
