102 Key to the System of 



497. Spikelet somewhat elongated, producing biseriate floral 



bracts. 



Sepals and petals absent ; stamens and pistils placed to- 

 gether ; stamen one ; anther one-celled ; stigma one ; 

 fruit one-celled, dehiscent with one slit. Aphelia. 1907 



Spikelet abbreviated to a fascicle. 



Flowers sometimes reduced to two or one ; sepals and petals 

 absent ; stamens and pistils placed together ; stamen one ; 

 anther one-celled ; fruit one-celled, dehiscent with one 

 slit. Ceutrolepis. 1908 



498. Flowers all dispersed. 



Sepals and .petals present ; stamens three ; stigmas three ; 



fruit three-celled, dehiscent. Lepyrodia. 1912 



Flowers all in spikelets or the pistillate flowers 

 solitary ... ...499 



499. Fruit two- or three-celled. 



Spikelets usually in panicles ; staminate and pistillate 

 flowers in distinct spikelets ; sepals and petals present ; 

 stamens three ; stigmas two or three ; fruit dehiscent. 



Bestio. 1914: 



Fruit one-celled 500 



500. Fruit dehiscent. 



Spikelets several or many, usually in panicles ; sepals and 

 petals present ; stamens generally three ; stigmas three. 



Leptocarpus. 1917 



Fruit indehiscent 501 



501. Stigmas two or three. 



Stems and branches often twisted or curled ; pistillate 

 spikelets one-flowered ; sepals and petals present ; stamens 

 three. Figure 124. Calostrophus. 1918 



Stigma one. 



Stems erect, unbranched ; clasping leafstalks very de- 

 ciduous ; spikelets often singly terminal, all with more 

 than one flower ; sepals and petals present ; stamens 

 three. Lepidobolus. 1919 



