54 Annals of the Carnegie Museum. 



Spikelets pubescent. 



89. Paspalum virgatum. 

 Spikelets glabrous. 

 90. Paspalu7n virgatutn v-ar. Schreberianum. 

 Spikelets unequally biconvex; paniculate, or if racemose, 

 with the first glume present. 

 Glumes awnless. 



Second glume broad and saccate; panicle contracted 

 or spike-like. 

 Spikelets 2 mm. long, panicle dense. 



97. Sacciolepis Myiiros. 

 Spikelets 3 mm. long, panicle often interrupted. 



98. Sacciolepis vilvoides. 

 Second glume not broad nor saccate; margins of 



lemma inrolled (Panicum). 

 Inflorescence consisting of several spike-like, 

 more or less secund racemes. 

 Fruit smooth and shining, spikelets not over 

 1.5 mm. long. 

 Rachis pilose; pedicel short, subequal. 



114. Panicum pilosum. 

 Rachis not pilose; pedicels unequal, 

 panicle less regular. 



no. Panicum laxum, 



Fruit transversely wrinkled; spikelets turgid. 



Spikelets hispidulous pointed, first glume 



acute 103. Panicum adspersum. 



Spikelets glabrous; first glume truncate. 

 109. Panicum geminalum. 

 Inflorescence a more or less diffuse panicle, not 

 consisting of spike-like racemes. 

 Stems woody, resembling bamboos. 



Panicle large and spreading, 10-20 cm. 



long 112. Panicum Sloanei. 



Panicle small and few-flowered, usually S 



cm. long loi. Lasiacis divaricate. 



Stems herbaceous. 



Plants forming winter- rosettes; secondary 



reduced panicles borne after the 



maturity of the primary terminal 



panicle. 



Ligule a ring of hairs 1-1.5 mm. long; 



spikelets pubescent, 1-1.5 mm. long. 



102. Panicum acuminatum. 



Ligule inconspicuous. 



Autumnal state a flat mat or 



