1 1 8 POACEAE 



i. C. verticillata (L.) Scribn. About dwellings and in waste 

 places: N. S. and Ont. to N. J., Mo. and Neb. Naturalized 

 from Europe. 



Not uncommon as a weed in cities. 



2. C. glauca (L.) Scribn. In waste places: nearly throughout 



N. Am. Native of Europe. 

 Common as a weed, in most parts of our area. 



3. C. imberbis (Poir.) Scribn. (C. versicolor Bicknell). In 



moist soil: Mass. to Kan., south to Fla. and Tex. Also in 



tropical Am. and the Bahamas. 



Conn. Rare along the coast, unknown elsewhere. 



N. Y. Along the shores of L. I. and S. I. and near Van Courtlandt 



Park, and Kingsbridge, N. Y. City, not recorded elsewhere. 

 N. J. Common along the coast, rare inland at Pemberton Junction, 



Delanco and Camden, unknown elsewhere. 

 Pa. Delaware Co. (according to Pennell). 



Confined mostly to the coastal region of our range. 



4. C. viridis (L.) Scribn. In waste places: nearly throughout 



N. Am. Native of Europe. 

 Locally common as a weed. 



5. C. italica (L.) Scribn. In waste places and escaped from 



cultivation: Que. to Minn., south to Fla. and Tex. 

 Rare as an escaped weed. 



6. C. magna (Griseb.) Scribn. In swamps: N. J. and Del. to 



Fla. and Tex. Also in Cuba. 



N. J. Localized in Cape May Co. (according to Stone). 



18. Cenchrus L. 



Body of the involucre 6-8 mm. broad, pubescent with very long 



hairs, the spines commonly 5-8 mm. long. 1. C. tribuloides. 



Body of the involucre rarely exceeding 5 mm. broad, pubescent, 

 the spines 3-4 mm. long. 2. C. carolinianus. 



i. C. tribuloides L. In sands along the coast: L. I. and N. J. to 

 Fla. and Miss. 



N. Y. Rare along the shore of western L. I. and on S. I., not 



reported elsewhere. 

 N. J. Common along the sea coast especially southward. 



Practically confined to the coastal region of our range. 



