230 COMPARATIVE ANALYSIS. 



TKIANDRIA. Monogynia. 



XAEDTJS. 



Florets spiked, unilateral .... Stricta. 



TKIANDRIA. Digynia. 



ALOPECURUS. 



1. Glumes not united . . . Ihdbosus, 

 Glumes united at base. ... 2 



2. Spike ovate, inflated sheath of upper leaf thrice as long as 



the leaf ..... Alpinus. 



Spike cylindrical, sheath not thrice as long as upper leaf 3 



3. Culm erect, glumes acute ... 4 

 Culm ascending, glumes obtuse . . .5 



4. Spike obtuse, awn twice length of corolla . . Pratensis. 

 Spike acute, awn more than twice length of corolla . Agrestis. 



5. Awn as long as the glumes . . . Fulvus. 

 Awn longer than the glumes . . Geniculatw. 



PHALARIS. 



Spike dense, ovate . . . . Canariensis. 



Panicle branched . . . Arundinacea. 



AMMO PHIL A. 



Glumes acute . . . Arundinacea. 



PHLETTM. 



1. Glumes awnless, twice as long as the corolla . Arenarium. 

 Glumes mostly awned, not twice as long as the corolla . 2 



2. Glumes naked or downy (not ciliated) at the back. 3 

 Glumes ciliated at the back . . .4 



3. Culm mostly branched, glumes wedge-shaped . Asperum. 

 Culm simple, glumes lanceolate . . Bcehmeri. 



4. Glumes lanceolate, gradually tapering Michelii. 

 Glumes truncated. . . . .5 



5. Spike ovate-oblong, awn as long as the glume . Alpinum. 

 Spike cylindrical, awn shorter than the glume . . Pratense. 



LAGUBUS. 

 Awns long ..... Ovatus. 



MrxnrM, 



Florets glabrous .... E/iisum. 



GASTRIDITJM. 



Awn twice as long as the glumes . . . Lend! gcr urn. 



