454 Key to the System of 



1927. Leaves prominent- or compressed-quadrangular. 



Rather tall ; stems somewhat quadrangular ; leaves rather 



long ; panicle moderately or hardly spreading ; spikelets 



crowded ; floral bracts brownish, pointed, somewhat 



fringed; stamens and stigmas three; fruit turgidly obovate. 



(Cladium tetraquetrum). G. tetraqiietra. 



Leaves flat or channelled or cylindrical ... 1928 



1928. Leaves flat. 



Rather dwarf ; stems much compressed ; leaves placed ver- 

 tically, moderately long, all basal, flat, hardly raised along 

 the median line ; panicle contracted ; spikelets somewhat 

 clustered ; floral bracts brownish, pointed ; . stamens and 

 stigmas three ; fruit turgidly ovate, not rarely retained by 

 the elongated stamens. 



(Cladium schoenoides.) G. schoenoides. 



Leaves channelled or cylindrical ... ... ... 1929 



1929. Floral bracts blackish 1930 



Floral bracts brownish ... 1934 



1930. Panicle much contracted ... 1931 

 Panicle amply spreading ... 1932; 



1931. Spikelets minute, their fruit narrow-ellipsoid. 



Rather tall ; stems slender, leafy ; leaves long, channelled, 

 much narrowed upwards, rough, straight-pointed ; panicle 

 long ; spikelets scattered ; bracts much pointed ; stamens 

 mostly four ; stigmas three ; fruit somewhat trigonous. 



(Cladium microstachyum.) G. microstachya. 



Spikelets of considerable size, their fruit trigonous- 

 ovate. 



Rather tall ; stems leafy ; leaves long, channelled or along 

 the margin involute, rough, straight-pointed ; spikelets 

 scattered, narrow ; lower bracts much pointed ; stamens 

 three ; anthers very narrow ; stigmas three ; fruit rather 

 prominently triangular. 



(Cladium Radula.) G. Radula. 



1932. Well-matured fruit bright-red. 



Very tall, densely tufted ; stems leafy, many ; leaves very 

 long, channelled, rough, much narrowed and recurved at 

 the upper end ; panicle ample and much elongated, partly 



