352 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 



var. CRiSPUM DC. — Occasional with the type. Williamstown; 

 Alford; New Marlboro. 



TARAXACUM. Dandelion. 



{Leonlodon 111. Fl. ed. 2.) 



T. LAEviGATUM (WiUd.) DC. Red-seeded Dandelion. — (T. 

 erythrospermum Man. ed. 7; L. erythrospermum III. Fl. ed. 2.) 



Fields and hillsides in thin soil; frequent. 



T. OFFICINALE Weber. Common Dandelion. — (L. Taraxacum.) 



Fields and roadsides; common. 



var. palustke (Sm.) Blytt. — Swamps; occasional. Stockbridge; 

 New Marlboro (Walters); Sheffield (Walters). 



TRAGOPOGON. Goat's Beard. 

 T. pkatensis L. — Fields and roadsides ; frequent. 



TUSSILAGO. Coltsfoot. 



T. Farfara L. Coltsfoot. — Brooks, ditches and wet slopes ; 

 common. 



XANTHIUM. CocKLEBUR. 



X. echinatum Murr. — Clear dry sand, Sheffield (Walters). 

 X. pungens Wallr. — (X. canadense Man. ed. 7; X. pennsylvanicum 

 111. Fl. ed. 2.) 



Alluvial ground; frequent in the valley. 



X. SPINOSUM L. — Dump at woolen mill, Pittsfield. 



