r 



TRIANDRTA. DIGYNIA. Agrostis. 



v 



to be done on account of the difficulties they have occasioned, and 

 the confusion in which they have been involved. 



SYNOPSIS OF THE SPECIES. 



( 1 ) With awns. 



A. Spi' ca-ven' ti . Cal. husks nearly equal : lloss. valves 



equal : awn twice the length of the blossom, fixed 

 just beneath its point. 



A. palus'tris. Cal. husks equal : lloss. outer valve twice 



the length and breadth of the inner : awn shorter 

 4 than the blossom, fixed just beneath its point. 



A. cani'na. Cal. husks nearly equal : lloss. valves very un- 

 equal : awn twice as Jong as the blossom, fixed just 

 beneath its middle. 



A. vinea'lis. Cal. husks equal : lloss. valves nearly equal : 



awn as long as the blossom, fixed just beneath its 

 middle. 



A. pal'Uda. Cal. husks unequal : lloss. inner valve hair- 

 like, very short: awn rather longer than the blossom, 



fixed beneath its middle. 



A. alpi'na. Cal. husks unequal: lloss. with hairs at the 



base : awn twice the length of the blossom, fixed 

 near its base. 



A, littora'lis. Panicle spike-like : calyx awned. 



(2) Without aiuns. 



A, al'la. Panicle large, spreading: calyx, both valves ser- 

 rulated on the keel. 



A. ni'gra. Panicle scattered, branches bare at the base; 



orctsfew: calyx, inner valve smooth. 



A. stolonif'era. Panicle compact; branches short, stiff, 



densely crowded with florets at the base: calyx inner 



A. 



valve smooth; outer only serrulated upwards. 



mar i f tima. Panicle large, rather spreading, longer 

 branches naked at the base, shorter crowded with 

 florets : calyx inner valve smooth, outer serrulated 

 upwards. 



A. vnlga'ris. Panicle spreading: branches bare at the 



base; florets numerous ; calyx inner valve smooth, 

 outer serrulated upwards : lloss. inner valve but half 

 the size of the outer ; deciduous. 



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