382 97. GRAMINEJE. 



Suborder I. CLISANTHE.E. 



Flowers closed. Styles or stigmas long, protruded at the top 

 of the flower. 



Tribe I. PANICEAZ. Spikelets dorsally compressed,l -flowered, 

 or with 1 fl. and an inferior gluraelike rudiment or a neuter 

 flower. Lower gl. much the smaller. 



1. DIGITARIA. Spikes fingered. Spikelets in pairs on one 

 side of the flattened rachis, awnless, 1 -flowered with an in- 

 ferior rudiment. Gl. 2, lower minuter or 0, upper 3- veined. 

 Sterile fl. of one 5 7-veined pale equalling the flower. 



[2. ECHINOCHLOA. Spikes compound, secund in the whole 

 and in each part. Spikelets on one side of the flattened 

 partial rachis, 2-flowered, inferior fl. rudimentary. GL 2, 

 lower 3- veined, upper equalling fl. 5-veined mucronate or 

 awned. Lower pale of sterile fl. like and equalling upper 

 glume.] 



3. SETARIA. Spike cylindrical, compound. Spikelets sur- 

 rounded by an involucre of bristles, 2-flowered ; inferior fl. 

 rudimentary. Gl. 2, lower 3 -veined, upper equalling fl. 

 many-veined. Sterile fl. of 1 pale, like and equalling upper 

 glume. 



Tr. II. CHLORTDE^E. Spikelets laterally compressed, 1- 

 flowered in our plants and sometimes with a superior rudi- 

 ment, placed in 2 rows on one side of a flattened rachis, or 

 alternate and unilateral. 



4. CYNODON. Spikes lingered, spreading. Spikelets 1- 

 flowered, awnless, with a superior rudiment. Gl. nearly 

 equal, patent. Pales equal ; lower boatshaped, compressed, 

 embracing the inner. Styles long, distinct. Stigmas fea- 

 thery. 



5. SPARTINA. Spikes upright, in a raceme. Spikelets 1- 

 flowered, awnless. Gl. unequal ; upper lanceolate. Pales 

 unequal ; lower boatshaped, compressed. Styles long, 

 united half-way up. Stigmas feathery. 



6. KNAPPIA. Inflorescence a somewhat l-sided raceme. Gl. 

 not keeled, blunt. Fl. 1 Pale 1, scarious, very hairy, ob- 

 tuse, not awned. 



Tr. III. PHALARIDE^E. Panicled. Spikelets laterally com- 

 pressed, 1 -flowered, with 1 or 2 or more glumelike inferior 

 rudiments; or 1 or 2 inferior male flowers. Gl. equal, 

 covering the flowers. Styles long. Stigmas filiform. 



7- PHALARIS. Gl. 2, boatshaped, keeled, membranous, nearly 



