Flora of Denver. 29 1 



which are almost leafless, or with bract-like leaves. It can 

 readily be distinguished from Lygodesmia by tke plumose 

 pappus instead of hair-like bristles. Near Denver. Summer. 



231. Tragopogon porrifolius L. (OYSTER-PLANT, SALSIFY.) 

 Escaped from cultivation. Summer. 



232. Crepis intermedia GRAY. Ashy, leaves oblong- 

 lanceolate in outline, irregularly dentate or laciniate, taper- 

 ing; heads of yellow flowers in a corymb; akenes almost black, 

 ten-ribbed ; pappus about equaling akenes, very soft and white. 

 Berkeley. Spring. 



233. Lygodesmia juncea DON. Diffusely branching from 

 a perennial root, stems striate, leafless except for occasional 

 scale-like leaves; lower leaves parted, divisions linear, rays 

 pink. Common and variable in flowers, leaves, and stems. 

 Summer. 



234. Lygodesmia rostrata GRAY. Annual, erect, leafy 

 heads small, numerous in a corymbed panicle with erect 

 branches; akenes tapering at summit, rays light pink soon 

 fading. North Denver. Along the Platte near Valverde. Late- 

 summer. 



235. Troximon glaucum NUTT. (PRAIRIE-DANDELION.) 

 Perennial, without a stem; leaves linear-lanceolate, wavy 

 margined, somewhat white woolly; large heads of yellow flow- 

 ers with rays often brown-tinged. On the plains in early 

 spring. A variety of this variable species is found along the 

 Platte under the trees. It has very long leaves sparingly 

 laciniate, and small long-stalked heads of brownish flowers. 



236. Taraxacum Officinale WEBER. The common East- 

 ern dandelion introduced in grass seed. Along the ditches and 

 on lawns, etc. 



