456 Key to the System of 



1936. Clusters of spikelets scattered in the panicle, their 



bracts blunt. 



Very tall ; leaves very long, channelled, rather broadish- 

 linear, but at the upper end much narrowed, greyish- 

 green, rough ; panicle leafy, widely spreading, often 

 somewhat corymbous, partly recurved ; spikelets quite 

 small, in ultimate capitular clusters ; stamens mostly 

 two, occasionally three ; stigmas three or sometimes two 

 or four ; fruit hard, turgidly ovate, slightly trigonous ; 

 seed black outside. 



(Cladium Mariscus.) G. Mariscus. 



Clusters of spikelets crowded in the panicle, their 

 bracts pointed ... 1937 



1937. Fruit narrow-ellipsoid, pale-colored. 



Very tall, large-tufted; stems leafy, rigid; leaves very 

 long, channelled, much narrowed and recurved at the 

 upper end, rough ; panicle leafy, very elongated ; spike- 

 lets often irregularly crowded ; floral bracts pointed ; - 

 stamens three ; fruit elongated, slightly trigonous. 



(Cladium Filum.) G. Filnm. 



Fruit turgidly ovate, dark-colored. 



Very tall, large-tufted ; stems leafy, rigid ; leaves very 

 long, channelled, much narrowed and recurved at the 

 upper end, rough ; panicle leafy, very elongated ; spike- 

 lets often interruptedly crowded into clusters ; floral 

 bracts much pointed ; stamens four to six ; stigmas three, 

 one occasionally subdivided ; fruit short. 



(Cladium trifidum.) G. trifida. 



XiEPXDOSFXSRBKA. 



1938. Quite or rather tall ... ... ... 1939 



Rather dwarf 1946 



1939. Stems hollow ... ... 1940 



Stems solid ... ... 1941 



1940. Leaves rather blunt-edged. 



Stems hardly broad, compressed, leafless, blunt-edged, as 

 well as the leaves of comparatively soft texture ; leaves 

 very long, broadly linear, somewhat turgid, smooth, the 

 lowest floral leaf already quite short ; spikelets in an 

 elongated rather contracted panicle, slightly pointed ; 

 rudimentary sepals and petals of only about one-third 

 the length of the fruit. L. longitudinale. 



