CYPERACEAE (SEDGE FAMILY) 



13 a Average leaf 6 in. or more long 14 



b Average leaf less than 6 in. long 16 



14 a Spikelets ovate, scales usually spreading 



SWITCH GRASS. (P. virgatum.) 

 b Spikelets lanceolate, often purplish, scales not noticeably 



spreading 15 



15 a Stems erect; outer glume about half as long as spikelet 



AGROSTIS-LIKE PANICUM. (P. agrostoldes.) 

 b Stems usually decumbent, rarely erect; outer glume 

 about % as long as spikelet 



SPREADING PANICUM. (P. proliferum.) 



16 a Leaves not heart-shaped at the base; spikelets lanceolate 



SPREADING PANICUM. (P. proliferum.) 

 b Leaves more or less heart-shaped at base ; spikelets not 



lanceolate 17 



17 a Spikelets not hairy ...FORKED PANICUM. (P. dichotomum.) 

 b Spikelets more or less hairy 18 



1 8 a Spikelet globose, blunt at apex 



ROUND-FRUITED PANICUM. (P. sphaerocdrpon.) 

 b Spikelet elliptic, somewhat pointed at apex 19 



19 a Leaves clasping at the base 



VARIABLE PANICUM. (P. commutatum.) 

 b Leaves rounded but not clasping at the base 



NORTHERN PANICUM. (P. boreale.) 



53 OPLfSMENUS VARIEGATED PANICUM. (O. burmanni*) 



54 PHALARIS. 



i a Spikelets arranged in ovoid spikes 



CANARY GRASS. (P. canariensis.) 

 b Spikelets arranged in panicles 



RIBBON GRASS. (P. arundinacea* ) 



55 P&A. 



1 a Panicle with branches compressed ; stem much flattened, 



wiry CANADA BLUE GRASS. (P. compressa.) 



b Panicle with branches more or less spreading 2 



2 a Branches of panicle usually solitary; stem 3-15 in. long 



SPEAR GRASS. (P. annua.) 

 b Branches of panicle 3-5 in a whorl ; stems 1-4 ft. high 



KENTUCKY BLUE GRASS. (P. pratensis.) 



56 S6RGHUM. 



SORGHUM, BROOM CORN, KAFFIR CORN. (S. vulgdre.*) 



57 SACCHARUM SUGAR CANE. (S. oficinarum.*) 



2 CYPERACEAE. Sedge Family. 



1 a Spikelets in a single, terminal spike 3. Eleocharis. p 124. 

 b Spikelets not completely as in a 2 



2 a Spikelets in umbels subtended by an involucre of leaves 3 

 b Spikelets in terminal, axillary, or lateral clusters .... 7 



122 



