20 Cyperaceae 



Spikelets falling as a whole. Spikes solitary. 



Spartina. 

 Empty glumes persistent. Spikes digitate. Cynodon. 



7. Spikelets in two opposite rows. (For a see page 

 16, for /3 see page 19.) 



Tribe 8. Hordeae. Spikelets sessile in notches on 

 a simple rachis forming a spike. 



a. Style i. Spikes unilateral. Nardus. 



/9. Styles 2. Spikes bilateral. 



I. Spikelets solitary in notches of rachis. 



f Spikelets with the narrow sides to rachis. Lolium. 

 -|"|- Spikelets inserted broadside to the rachis. 

 Spikelets 1-2-flowered in a slender spike. Spikelets 

 sunken in the notches. Lepturus. 



Spike stout. Spikelets not sunken in the notches. 



Triticum (incl. Agropyrum and *Secale). 



II. 2-6 spikelets in each notch. 



1. Spikelets i -flowered. Hordeum. 



2. Spikelets 2-many-flowered. Elymus. 



Fam. 2. Cyperaceae. Grass-like herbs often with 

 triangular stems. Leaves with closed sheaths. Ligule 

 usually absent. Flowers in spikelets or spikelet-like 

 cymes, monoclinous or diclinous, naked or rarely with 

 homochlamydeous perianth. Stamens mostly 3-1, rarely 

 more. Anthers basifixed. Carpels (3-2). Styles 3-2 

 with filiform stigmas. Fruit an achene with free seed. 



Subfamily i. Scirpoideae. Spikelets with many 

 hermaphrodite flowers. Individual flowers in the spikelet 

 may be diclinous. Perianth present or absent. 



Tribe i. Scirpeae. No bracteoles. 



