230 



COMPARATIVE ANALYSIS. 



ALOPECTTBFS. 



1. Glumes not united . 



Glumes united at base .... 



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



the leaf . 



Spike cylindrical, sheath not thrice as long as upper leaf 



3. Culm erect, glumes acute . . . 

 Culm ascending, glumes obtuse 



4. Spike obtuse, awn twice the length of corolla 

 Spike acute, awn more than twice length of corolla 



5. Awn as long as the glumes . 



Awn longer than the glumes . . 



Spike dense, ovate 

 Panicle branched 



Glumes acute 



PHALARIS. 



AMMOPHTLA. 



PHLEUM. 



1 . Glumes awnless, twice as long as the corolla 

 Glumes mostly awned, not twice as long as the corolla 



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

 Glumes ciliated at the back 



3. Culm mostly branched, glumes wedge-shaped 

 Culm simple, glumes lanceolate 



4. Glumes lanceolate, gradually tapering . 

 Glumes truncated 



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

 Spike cylindrical, awn shorter than the glume 



Awns long 

 Florets glabrous 



LAGTOITS. 

 MILIUM. 



GASTBIDIUM. 

 Awns twice as long as the glumes 



POLYPOGON. 



Awns as long as the calyx, root creeping . 

 Awn much longei than the calyx, root fibrous 



CALAMAGEOSTIS. 

 1. Corolla with a terminal awn, panicle loose 



Corolla with a dorsal or basal awn, panicle close 



Bulboms. 



2 



Alpinus. 

 3 

 4 

 5 



Pratensis. 



. Agrestis. 



Fulvus. 



Geniculatus. 



Canariensis. 

 Arundinacea. 



Arundinacea. 



Arena r/um. 

 2 

 3 

 4 



Asperum. 



. Bcehmeri. 



Michelii. 



5 



Alpinum. 

 Pratense. 



Ovatus. 



Effumm. 



Lendigerum. 



Littoralis. 

 Monspeliensit. 



Lanceolata. 

 2 



