66 THE BIOLOGY OP HARDING COUNTY 



*457 Car dims nebraskensis Brit. 



Not uncommon in open woods of Little Missouri Valley. 

 458 Carduus umilatus Nutt. Plains Thistle. 



Common on prairies especially in sand grass patches, along 



valleys even in thickets. 



[Cirsiwn iowense (Pammel) Fernald. Plumed Thistle. 

 Reported by Fromme.] 



COMPOSITAE, tribe Cichorieae 



*459 Crepis glauca T. & G. 



Brooksides in Cave Hills and other forest reserves. 



460 Hiera-ceum canadensis Michx. 

 Tolerably common in woods. 



461 Hieracmtn umbellatum L. Hawkweed. 



Not uncommon in moist valleys of the timbered buttes. 



462 Lactuca pulchella (Pursh) DC. 

 Fairly frequent along all streams. 



463 Lygodesmia juncea Don. 



Frequent on the plains, common in fields. 

 *464 Lygodesmia rostrata Gray. 



Common on sandy stretches along the Grand River. 



465 Nothocalais cuspidata (Pursh) Greene. 

 A common ruderal. 



466 Sonchus asper (L.) Hill. 



Tolerably common along streams in the Slim Buttes. 



467 Tro.i'imon glaucum Nutt. 



Common in the grassy portions of the forest reserves. 

 *468 Troximon glaucum piimilum (Nutt.) A. Nels. 



Fairly frequent on the foothills of the Short Pines. 



LICHENS* 



Cladonia pyxidata (L.) Fr. 



Abundant on dry soil in the Badlands. 

 Parmelia mollinscula Ach. 



Very abundant on bare dry soil growing between sage, cactus 



and other clumps of vegetation. (Harding, Washington, 



Washabaugh Counties). 



*Determinations of Lichens and Mosses are by R. S. Williams of N. 

 York Botanical Garden. 



