145 



KEY TO TRIBES. 



Empty glumes at the base of the spikelet 2 or 1, fertile 

 glumes many, few or 1 to the spikelet, :^-ranked. 

 (Rhachilla of the spikelet itself rarely twisted; 

 after the glumes and nuts are fallen, the notches 

 on the rhachilla can be seen to be exactly 

 2-ranked). Hypogynous bristles none. 



Empty glumes at the base of the spikelet 2-0 ; fertile 

 glumes arranged spirally, many, often very 

 numerous. 



Empty gimnes at the l^ase of the spikelet usually 

 more than 2 ; fertile glumes few, very often 1. 



A Cypere^. 



B SCIRPE^. 



C ScHai;NE.E. 



KEY TO GENERA. 



SUB-ORDER SCIRPO-SCHCENE^. 

 A. CYPERE.E. 



Style 2-branched. 

 Style 3-branched. 



1 



Nut compressed laterally. 



rarely more nuts. 

 1 Nut compressed laterally. 



several or many nuts. 

 1 Nut compressed dorsally. 

 Rhachilla of spikelet persistent 

 Rhachilla of spikelet caducous. 



Spikelet bearing 1-2 

 Spikelet bearing 



Kyllinga. 



Pyoreus. 

 juncellls. 

 Cyperus. 

 Mariscus. 



B. SCIRPE^. 



Stem leafless with 1 terminal spikelet. 

 Hypogynous jjristles or scales none. 

 Hypogynous scales present. 



1 Style base constricted above the nut, persistent 



or deciduous without leaving a Initton. 

 1 Style deciduous leaving a button on the nut. 

 1 Style passing gradually and continuouslv into 



the nut. 

 1 Ovary on a more distinct obpyrimidal gynophore, 



otherwise as Scirpus. 

 1 Spikelets conspicuously hairy, otherwise as 

 Scirj)us. 

 2 Hypogynous scales 2, hyaline, standing fore and aft 



within the glume ; otherwise as Scirpus. 

 2 Hypogynous scale I, posticous, within the glume, 

 and longer than it, thickened upwards, almost 

 enveloping the nut, otherwise as Scipiis. 



Eleocharis. 



FlMBRISTYLlS. 



bulbostylis. 

 Scirpus. 



FlOINIA. 



Fuirena. 

 Lipocarpha. 



Ascolepis. 



