52 



AGROSTIDEAE 



awned. 

 bent. 



awns decidu- 



al 



1- nerved 



and 2- 

 wanting; 



Flowering glumes 

 base. 



at the 



Flowering glumes with long hairs 

 at the base. 



Flowering glume and palet thin 



membranaceous, 

 ^'lowering glume and palet chart- 



aceous. 



L'6. 



Tribe V. AGROSTIDEAE 



Flowering glumes considerably hardened when 

 mature and closely enclosing the grains, 

 or at least Hinier than the empty glumes. 

 Spikelets all perfect, not m pairs. 

 Flowering glume 8-awned (two sometimes 



very small). '12 



Flowering glume 1- 

 Awn twisted and 

 Awn not twisted. 



Floweiing glumes broad; 

 ous. 



Flowering glumes glabi'ous, or jjubes- 

 cent with short appressed hairs. 

 Flowering glumes pubescent with long 

 silk hairs much exceeding the 

 glume. 

 Flowering glumes narrow; awns per- 

 sistent. 

 Spikelets in i)airs, one jjgrfect, the other 

 staminate or sterile, in spike-like panicle. 

 Flowering glumes usually thin at maturity, at 

 least more delicate than the empty glumes; 

 grain loosely enclosed. 

 Stigmas subpluiiiose (i. e., with short hair 

 all around), projecting from the apex of 

 the nearly closed glumes: inflorescence 

 spike-like, cylindrical and crowded. 

 Rachilla of the spikelet jointed above the 

 empty glumes which are therefore per- 

 sistent. 



flachilla of the spiKelet jointed below the 

 empty glumes, and the spikelets there- 

 fore fall off entire. 

 Stigmas plumose, projecting from the sides 

 of the panicle: panicle mostly open and 

 spieading, sometimes crowded and spike- 

 like. 



Grain not permanently enclosed in the 

 flowering glumes: pericari) opening 

 readily at maturity. 

 Flowering glumes long hairy on the veins. 

 Flowering glumes not hairy on the veins. 

 Grain permanently enclosed in the 

 flowering glumes; the pericarp ad- 

 herent. 



Spikelets readily falling off when ma- 

 ture. 

 .Spikelets with the emjtty glumes 

 least i)ersistent. 

 Innermost glume (palet) 

 and 1-keeled; 1 stamen. 

 Innermost glume 2-nerved 

 keeled, or sometimes 

 stamens 3. 



naked 



21. Akistida, 

 l.i. Stipa. 



2 4. Okyzopsis. 



25. Eriocoma. 



muhlenbergia- 

 Ltcurus. 



!S. Phleum. 



!t. ALOPECURUS. 



.30. 



Blephakoneuron. 

 Spop.obolxjs. 



31. POLYPOGON 



32. CiNNA. 



AGROSTIS. 



36. Calam.\grostis. 



37. Calamovilfa. 



