26 Field Columbian Museum Botany, Vol. 2. 



(333), and common in irrigated cane fields at Guanica (734), Porto 

 Rico. Fields near San Domingo City (863). Rock-strewn arid plain 

 south of Progreso, Yucatan (1700). 



Capriola Dactvlon (L.) Kuntze Rev. Gen. PI. 764. 



Panicum Dactylon Linn. Old fallow field near Hamilton, Ber- 

 muda (125). On the sandbag earthworks in the fort of San Christobal, 

 San Juan, Porto Rico (359). 



Icmnanthus pallens Munro in Bth. PI. Hongk. 414. 



Panicum pallens Sw. Railroad embankment near Bayamon, Porto 

 Rico (352). 



Oplismenus compositus Beauv. Agrost. 54. 



Rich soil near Port Antonio, Jamaica (924). 



Oplismenus hirtellus (L.) R. & S. Syst. 2: 481. 



Panicum hirtellum Linn. North shore of Cozumel Island (1483). 



Chsetochloa brevispica Scribn, nom. nov. 



Panicum verticillatum parviflorum Doell. 1877 non Cenchrus parvi- 

 florus Poir. 1804, which is Chaetochloa parviflora Scribn. Margin of 

 bog at Walsingham (99) and old fallow field near Hamilton (127), 

 Bermuda. 



Ch^tochloa glauca (L.) Scribn. U. S. Dept. Agr. Div. Agrost. 4: 39. 

 Panicum glaucum Linn. Setaria glauca Beauv. On railroad em- 

 bankment near Bayamon, Porto Rico (348). 



Ch/Etochloa perennis (Curt.) Bick. Bull. Torr. Bot. Club. 25:107. 



Chamccraphis glauca perennis Curt. Growing in crevices of a coral 

 fence at Paget's, Bermuda (45, 50). 



Cenchrus echinatus Linn. Sp. PI. 1050. 



Old fallow field near Hamilton, Bermuda (134). Arid rock- 

 strewn plain south of Progreso, Yucatan "(1698). 



Cenchrus echinatus brevisetus (Fourn.) Scribn. comb. nov. 



Cenchrus brevisetus Fourn. Mex. PI. 2: 50. Sandy shore field 

 near Catano, Porto Rico (163), same situation near Charlotte Amalia, 

 St. Thomas (438), where it is called "BUr-grass," and near "The 

 Ovens," Santiago de Cuba (11 10). 



Cenchrus insularis Scribn. sp. nov. * PI. lviii. 



A rather stout, erect or ascending, branched annual 4-6 dm. high, 

 short ciliolate ligules, narrow, lanceolate leaves, 1-10 cm. long, 510 

 mm. wide, and exserted spikes about 6 cm. long; glumes scabrous 

 for a short distance below the spike, otherwise glabrous; leaves 

 glabrous beneath, scabrous above, axis of the spike flexuous and finely 

 pubescent, burs, including the bristles, about 12 mm. long, 8-10- 

 nerved to near the middle, the divisions silky villous towards the 

 base, about 6 mm. long, outer bristles 6-7 mm. long, purplish, and 

 downwardly barbed, bristles near the base of the burs numerous and 

 slender and spikelets 2-3 in each bur, about 6 mm. long, first glume, 



