Cyperaceae 2 1 



Subtribe i. Cyperinae, Glumes distichous. 



Only British genus : Cyperus. 



Subtribe 2. Scirpinae. Glumes spiral. 



Spikelets solitary, terminal. Bristles 3-8, included. 

 Style thickened at base. Heleocharis. 



Spikelets clustered and lateral. Bristles o, or 3-8, 

 included. Style not thickened at base. Scirpus. 



Spikelets solitary or clustered, terminal. Bristles 

 very long, cottony. Eriophorum. 



Subfamily 2. Rhynchosporoideae, Flowers in 

 spikelet-like cymes {psetido-spikelets) which are arranged 

 in spikes or heads, mono- or diclinous. PeriantJi bristles 

 present or absent. 



Tribe 2. Rhynchosporeae. Pseudo-spikelets few- 

 flowered. 



Pseudo-spikelets terete. Bristles slender or absent. 

 Fruit beaked. Rhynchospora. 



Pseudo-spikelets compressed ; glumes distichous. 

 Fruit not beaked. Schoenus. 



Pseudo-spikelets terete. Bristles o. Fruit obtuse. 



Cladium. 



Subfamily 3. CaiHcoideae. Flowers always naked, 

 diclinous, in many-flowered (rarely few-flowered), mono- 

 or diclinous spikelets. % flower enclosed in modified 

 bracteole {utriculus), 



Spikelets 1-2-flowered. Kobresia. 



Spikelets many-flowered. Carex. 



b. Achlamydeous flowers rare: their occurrence is 

 mostly due to reduction and is correlated zvith spathe- 

 development. Definite number of stamens and carpels 



