GENERA OR FAMILIES. 179 



73. Graminaceous Plants. Graminace^. 



* Spikelefs of one perfect terminal flower, ivitJi or without 

 a perfect male flower helow it. 



t Flowering glumes of a firmer texture than tJie empty ones 

 helow (Panicese). 



(805) Milium — panicle loose ; spikelets one-flowered ; glumes 

 two, flattish, equal ; pales two, equal, awnless ; stamens 

 three ; styles two. 



tt Two male or imperfect florets or minute rudimentary 

 glumes helow the perfect flower, besides the outer empty 

 glumes (Phalaridese.) 



C'OG) Digraphis — panicle somewhat contracted ; glumes two, 

 keeled, equal, each with a tuft of hairs at its base, re- 

 presenting an abortive floret ; pales two, equal, awnless ; 

 stamens 3 ; styles 2. 



** Spikelets icith one or more perfect flowers, the male or 

 rudimentary, if any, terminal. 



t Spihelets one-flowered, usually pedicellate (Agrostideae). 

 (807) Phleum — panicle spiked ; glumes two, keeled, equal, longer 

 than the pales, with an awn proceeding from the midrib ; 

 pales two, equal, awnless, membranous ; stamens three ; 

 styles two. 



(308) Alopecurus — panicle spiked; glumes two, equal, keeled, 



often connate at the base ; pale single, with an awu 

 arising from its base, ribbed ; stamens three ; styles two. 



(309) Lagurus — panicle contracted, ovate ; glumes two, equal, 



terminating in a long plumed awn ; pales two, the lower 

 with a dorsal twisted awn, bifid at the apex, the lobes 

 long, sharp, awn-like ; stamens three ; styles two. 

 310) Polypogon — panicle contracted, oblong ; glumes two, equal, 

 the lower awned under the apex, the upper from the apex ; 

 pales two, equal, convex, the lower awned beneath the 

 apex ; stamens three : styles two. 



• N 2 



