86 University of Texas Bulletin 



Senecio obovatus Muhl. 

 Valleys and flood plains. 

 Eastern states and Canada. 



Tribe CYNAREAE 



Carduus aiistrinus Small. Thistle. 



Abundant in low ground, fields and roadsides. The common 

 thistle. 



T^xas. 



Centaurea americana Nutt. Star Thistle. 



Roadsides in low ground. 



A tall thistle with pink or whitish heads three or four inches in 

 diameter. 



Southern plains and prairies to Mexico. 



Tribe MUTISIEAE 



Thyrsanthema nutans Kuntze. (Chaptalia nutans Hemsl.) 



Rich, moist soil on bluffs and in ravines of the Edwards Plateau. 



A rosette cf woolly leaves at the ground and a leafless stem bearing 



a nodding head of pink flowers. 

 Texas and Mexico. 



CICHOREACEAE Chicory Family 



(Tribe Cichoreaceae under Compositae.) 



Adopogon occidentalis Kuntze. (Krigia occidentalis Nutt.) Dwarf 

 Dandelion. 



Abundant in level uplands of the post-oak region. In woods and 

 pastures. 



Southern prairie states. 



Lactuca ludoviciana DC. Wild Lettuce. 

 Roadsides and waste places. 

 Prairie states. 



Lactuca virosa L. (L. scariola L.) Prickly Lettuce. Compass Plant. 



Roadsides and waste places. The leaves by the twisting of their 

 bases tend to stand vertically pointing north and south. 



Introduced from Europe and widespread in North America. 



Lygodesmia texana Green. (L. aphylla var. texana T. & G.) 



Dry ground. Roadsides. University campus. An almost leafless 



plant with slender, green branches and large, delicate, lavender heads. 

 Texas. 



