52 Mr. Woods on the Genera of European Grasses. 



4. Andropogon. Spiculse linear, lanceolate. Seeds nearly linear. 



In the European species of this genus, except in A. Gryllus and A. Allionii, 

 the spiculce are in fingered spikes. 



2. Spiculae all fertile, in two rows, on one side of a flattened rachis. 



6. Digitaria. Spikes fingered. Spiculse unarmed. 



7. Oplismenus. Spikes racemose, or panicled. Spiculse naked. Glumes 



keeled, pointed, or setigerous. 



3. Spiculee all fertile, in a compound spike tiled all round. 



8. Setaria. Spiculse accompanied by setiform bractese. 



9. Pennisetum. Inner bractese feathery. 



4. Spiculse all fertile, disposed in sets, one sessile, and one or two 

 stalked, enveloped in long silky hairs. 



1. Saccharum. Awnless. Squamulse 2. Inner palea minute, or wanting. 



Panicle not spike-like. 

 3. Erianthus. Lower palea of the fertile floret awned. Squamulse 2. Sta- 

 mens 2 or 3. Panicle spreading. 



2. Imperata. Awnless. Squamulse 0. Panicle spike-like. 



5. Spiculse all fertile, scattered, not enveloped in hairs. '. 



14. Phalaris. Additional scales short, unarmed. Glumes navicular, keeled, 

 inclosing. Palese coriaceous. 



15. Anthoxanthum. Additional scales large, inclosing the scariose palese, 

 awned. Glumes inclosing. 



10, Panicum. Additional scale large, glume-like, embracing the horny rib- 

 less palese. Glumes not inclosing. 



E. Spiculse 1 or more flowered, without additional external scales, 

 sessile, or nearly so, in two rows on one side of a flattened 

 rachis. 



In this, and all the following divisions, all the spiculse are perfect, except in 

 Lappago, where the uppermost of each short spike are barren, or neuter and ta- 

 bescent, and Cynosurus, where the barren spiculse form a sort of involucrum. 



