726 REPORT OF NEW JERSEY STATE MUS,EUM. 



Common thronghont the Stale as a weed in cultivated gTOund. 

 It is obviously not native in the Pine Barrens, but its original 

 distribution in the other districts cannot be ascertained. 



Fl. — Early August to mid-September. 



XANTHIUM L. 



Xanthium canadense Mill. Cocklebur. 



Xanthimn Canadense Miller, Gard. Diet. Ed. VIII. 1768 [Penna. and Mary- 

 land]. 



Occasional in open moist ground of the Middle district. 

 Fr. — Mid-September into October. 

 Middle District.— Mt. Holly. 



Xanthium commune Britton. Clotbur. 



Xanthium commune Britton, Man. 912. 1901 [Westport, N. Y.]. 



Frequent in open moist ground of the Middle district. 

 Fr. — Mid-September into October. 

 Middle District. — New Egypt, Camden. 



Xanthium echinatum Murr. Beach Clotbur. 



Xanthium echinatum Murray, Comm. Goett. VI. 32, pi. 4. 1785 [New York]. 



Keller and Brown 314. 

 Xanthium strumarium var. echinatum Knicskern. — Willis 2>2>- 

 Xanthium canadense var. echinatum Britton 143. 



Sand dunes of the sea coast and lower Delaware Bay, common. 

 Fr. — Mid-September into October. 



Maritime.— forked River, Spray Beach (L), Cedar Bonnet (L), Ocean 

 City, Stone Harbor, Five-Mile Beach, Cape May, Cape May Pt. (S). 



Family COMPOSIT.^. 



Key to the Species. 



a. Flowers all tubular, no flat ray flowers present. 

 b. Flowers white, greenish or yellow. 



c. Shrub with copious white silky pappus in fruit. Baccltaris, p. 764 



cc. Herbs. 



d. Flowers white. 



c. Wooty, flowers in small, dense heads, with abundant white 

 pappus. 

 f. Dioecious. 



g. Stem 3-9 dm. high, stem leafy. Anap halls, p. 7C7 



