GRASSES. 361 



Type locality not ascertained. 

 Economic uses: Valuable as the last. 

 Herb. Geol. Surv. Herb. Mohr. 



Chaetochloa magna (Griseb.) Scribner, Bull. U. S. Dept. Agr. Div. Agrost. 4 : 39. 1897. 



LARGE SWAMP MILLET. 



Setaria magna Griseb. Fl. Brit. W. Ind. 554. 1864. 



Chap. Fl. e'd. 3, 588. 



WEST INDIES (BERMUDA). 



Carolinian and Louisianian areas. On the coast from Delaware to Florida and 

 Louisiana. 



ALABAMA: Coast plain. Grassy marshes, Mobile River. July. Rare. Annual. 



Type locality : " Hab. Jamaica ! " 



Chaetochloa caudata (Lam.) Scribner, Rep. Mo. Bot. Gard. 10 : 52. 1899. 



Panioum caadatum Lam. Tabl. Encycl. 1: 171. 1791. 



Setaria caudata Roem. & Schult. Syst Veg. 2 : 495. 1817. 



A slender, somewhat cespitose annual 1 to 2 feet high ; the culm branched from 

 thebase; the leaves narrowly linear; the panicle elongated (from 5 to 15 inches long), 

 attenuate, few- flowered; the bristles solitary; the spikelets ovate, acute, short- 

 pedicellate. 



WEST INDIES, MEXICO, SOUTH AMERICA. 



Carolinian and Louisiauian areas. New Jersey, along the coast to Mississippi^). 

 Adventive from tropical America. Indigenous in Florida and southern Texas. 



ALABAMA: On ballast heaps. Mobile (1891). (?) 



Type locality: "E Brasilio. Commers. & Cayenna. D. Richard." 



Herb. Geol. Surv. Herb. Mohr. 



CENCHRUS L. Sp. PL 2 : 1050. 1753. SANDBUR. 



About I'J species of tropical and temperate regions of both hemispheres. 

 Cenchrus tribuloides L. Sp. PI. 2 : 1050. 1753. COMMON SANDBUR. 



Cenchrus carolinianus Walt. Fl. Car. 79. 1788, 



Ell. Sk. 1 : 93. Gray, Man. ed. 6, 634. Chap. Fl. 579. Coulter, Contr. Nat. Herb. 

 2 : 510. Wats. Bot. Calif. 2 : 261. 



WEST INDIES, MEXICO TO BRAZIL. 



Carolinian and Louisianian areas. Eastern United States, southern California. 



ALABAMA: From the Tennessee valley to the coast, on sandy waste ground. Most 

 abundant near the const. Mobile. July to October. A pernicious weed. 



Type locality : " Hab. in Virginiae inaritiuiis." 



Herb. Geol. Surv. Herb. Mohr. 



Cenchrus macrocephalus Scribner, Bull. U. S. Dept. Agr. Div. Agrost. 17:110, /. 

 406. 1899. LARGE SANDBUR. 



Cenchrus tribuloides macrocephalus Doell in Mart. Fl. Bras. 2, pt. 2 : 312. 1877. 



BRAZIL, ARGENTINA. 



Carolinian and Louisianian areas. New Jersey along the coast to Louisiana. 



ALABAMA: Littoral belt. Shifting sands. Baldwin County, eastern shore of 

 Mobile Bay. Mobile County, dunes of Dauphin Island. Flowers July to October. 

 Not infrequent. Annual. 



Stouter than the last, the ascending stems 8 to 12 inches longj spikelets fully 

 twice as large. 



Type locality : Brazil. 



Cenchrus incertus M. A. Curtis, Bost. Journ. Nat. Hist. 1 : 135. 1837. 



SOUTHERN SANDBUR. 



Cenchrus strict us Chap. Bot. Gaz. 3 : 20. 1878. 



Chap. Fl. Suppl. 667; ed. 3, 588. Scribner, Bull. U. S. Dept. Agr. Div. Agrost. 

 17:109,/. 405. 



Louisianian area. North Carolina along the coast to Florida and western Texas. 



ALABAMA: Coast plain to adjoining pine hills. Dry, sandy soil. Mobile and 

 Baldwin counties, shores of Mobile Bay. Mobile County, Springhill. July to Octo- 

 ber. Often a troublesome wayside weed. 



Type locality : "West coast of Florida, Appalachicola and southward." 



Cenchrus echinatus L. Sp. PI. 2 : 1050. 1753. HEDGEHOG GRASS. 



Chap. Fl. 578. Coulter, Contr. Nat. Herb. 2 : 510. 

 WEST INDIES, MEXICO TO BRAZIL. 

 Louisianian area. Coast, North Carolina to Florida. 



