55 



Fig. 37. Panicum lineare Krock (Panicum gldbrum Gaud.; 

 Syntherisma linearis Nash). Smooth Crab-grass. — A slender, 

 glabrous annual 1.5 to 3.5 dm. high, with culms which are much 

 branched below, flat leaves, and 2 to 6 slender diverging spikes. — 

 Naturalized in waste and cultivated laud; Nova Scotia to Ontario 

 and South Dakota, south to Florida and Texas. [Europe.] August- 

 October. 



