110 



Fig. 406. Cenchrus macrocephalus Scribn. new name. (C. 

 tribuloides macrocepludus Doell, Flor. Bras., 2 : part 2, 312. 1877, 

 ex char.) Large Sand-bur. — A coarse, much branched and leafy 

 annual, with prostrate or ascending culms 3 to 6 dm. long, and 

 dense spikes 2 to 8 cm. long. Involucres or "burs" (a) pubescent, 

 about 8 mm. long and 6 mm. broad, with numerous stout spines. — 

 Sands along the coast, New Jersey and southward ( ?), New Orleans. 



Burs about twice the size of those of Cenchrus tribuloides. 



