GUAMINPLEl 51 



at the base of fl. gls., always produced beyond the 

 uppermost fl. gl. 



Subtribe I. Arundinece. Spikelets panicled, 2-many-fld.; 

 gls. very narrow, flg. penicillate with long silky hairs 

 on the callus or sides or both, lowest fl. gl. some- 

 times male or neuter. 



Rachilla elongate, glabrous ; fl. gl. silluly hairy. 



64. Arundo. 



Rachilla very short ; fl. gls. glabrous, callus with 

 long silky hairs. 65. Phragmites. 



Subtribe II. Eragrostece. Infl. various. Spikelets 2-many- 

 fld.; fl. gls. 1-3-nerved, entire, 3-toothed, 3-lobed or 

 3-awned. 



Infl. various ; spikelets many-fld.; empty gls. shorter 



than the lowest fig. gl., 1-nerved; flg. gls. 3-nerved; 



grain very minute terete. 66. Eragrostis. 



Spikelets sessile on the spiciform branches of a tall, 



broad panicle, many fld.; fl. gls. 3-4-toothed. 



67. Diplachne. 



Subtribe III. Centothecece. Spikelets 1 -many-fld., 1-2- 

 seriate on the rachis of a simple spike or on the 

 long slender branches of a simple panicle Leaves 

 broad, tessellately nerved. 



Spikelets 1-fld., secund and articulate at the base ; 

 upper gls. empty convolute with setiform tips. 



68. Lophalherum. 



Spikelets 3- or more fld., secund, persistent : fruit- 

 ing gls. with reflexed submarginal bristles, (but 

 bristles are entirely absent in the Formosan 

 var. inermis). 69. Centotheca. 



Subtribe IV. Eufestucece. Spikelets usually panicled, 2 



