64 PANICACE.E. 



Garler 300; Alabama, McCartliy ; Mexico (Kio Blanco), Palmer 

 679, 589, Pringle 820. 



South Carolina to Florida, Mexico, and South America. 



32. A. contortus L. Sp. PI. 1045 (1753). 



Perennial ; culms ascending or erect, 40-100 cm. high. 

 Sheaths compressed, very smooth ; ligule short, truncate, ciliate ; 

 blades soon conduplicate, narrow, ciliate with a few hairs, the lower 

 acute, 8-20 cm. long, 3-8 mm. wide, the upper very short, erect. 

 Eacemes (besides the awns) 4-7 cm. long, erect or curved. Pistil- 

 late spikelets slightly curved, on a callus 3 mm. long, first glume 

 hard, brown, hairy, nerves obsolete, fourth awned, 6.5-12 cm. 

 long; palea 0. Grain linear, white. The staminate spikelets lan- 

 ceolate, pedicellate, 8-10 mm. long, first glume herbaceous, rather 

 obtuse, keeled, second inequilateral, obscurely 13-nerved, equalling 

 or exceeding the first, membranous, acute, 3-6-nerved; palea very 

 short, ciliate. 



Very variable and widely distributed over tropical Asia, Africa, 

 Australia, Texas and Mexico of North America; also South America. 

 Xo attempt has been made to place these in subvarieties after Hackel. 



Mexico, Palmer 267, 767, 767a, 1156 ; S. Calif., Palmer 122; 

 Arizona, Pringle; Cent. Mex., Parry and Palmer 955; Cuba, 

 Wriglit 1595. 



Subgenus 8. Cymbopogo^st. Hack. D. C. Monog. Phan. 6 : 592 

 (1889). Cymhopogon Spreng. as a genus. PI. Min. Cogn. Pug. 

 2 : 14 (1815). 



Eacemes simple, in pairs, at the apex of the branches, usually 

 included by the sheath, one subsessile, the other pedicellate. Two, 

 rarely 7-9 of the lowest spikelets of the subsessile racemes stami- 

 nate or neuter, awnless. The flowers of the upper sessile spikelets 

 perfect, flattened on the back or subcylindrical, usually awned. 



Tall tropical or subtropical grasses ; rare in America. 



33. A. Ruprechti Hack. Flora 68 : 126 (1885). Hyjjarrlienia 

 Bnprechti Fourn. Mex. PI. Enum. Gram. 67 (1886). A. an- 

 tMsliroides Eupr. Bull. Acad. Brux. 9 : 245 (1842), not Hochst. 



Perennial ; culms solid, simple below, much branched above, 

 1.5-2. 5 m. high. Sheaths slightly compressed, more or less hirsute ; 



