28 Flora of Denver. 



223. Artemisia filifolia TORR. Shrubby, branches very 

 numerous from the lower stems, slender leaves 2 to 3-parted or 

 entire with filiform divisions, heads very small, short; racemes 

 of the narrow panicle surpassed by the leaves at the base. 

 Whole plant whitened with close minute tomentum. Com- 

 mon in North Denver. The flower buds often become infested 

 with a gall fly the larva? of which inhabit the buds. Fall. 



224. Artemisia dracunculoides PURSH. Smooth with 

 leaves either entire or 3-cleft, branching, with many small 

 heads. On the Denver plains. 



225. Senecio aureus L. var. compactus GRAY. One of 

 the numerous varieties of this variable species. Low, sparingly 

 woolly, leaves irregularly lobed ; thickish heads in a spreading 

 cyme; rays and disk yellow. The early and common spring 

 Senecio. 



226. Senecio Douglasii DC. Stems usually many from 

 the root, leafy with pinnately parted leaves, divisions long and 

 linear, thick, rays yellow, inch long, heads in a spreading 

 many-flowered cyme. Common in the fall. 



227. Cnicus ochroce'ntrus GRAY. * (THISTLE.) Stout, 

 leaves and stem white tomentose, prickles long and yellow; 

 disk white or crimson, bracts of the involucre sticky, tipped 

 with a broad stout spreading yellow prickle. Common in 

 early summer. 



228. Cnfcus undulatus GRAY. Similar, but neither so 

 tall nor so stout, heads smaller, prickles of the involucre short 

 and rather weak. In North Denver. Fall. 



229. Cichorum Intybus L. (CHICORY.) Introduced 

 around Italian gardens in North Denver. 



230. Stephanomeria runcinata NUTT. Diffusely spread- 

 ing, small pink flowers, numerous near the ends of branches, 



