GRAMINE^ 179 



Tribe i. Oryze^E. — Spikelets compressed laterally; 

 lower (barren) glumes minute or o; uppermost glume 

 and pale bearing a single flower. Not alpine. 



1. Leersia, Sol. 



Characters of the tribe. 



L. oryzoides, Sw. {Oryza clandestina, Br.) ; panicle 

 often undeveloped ; in water, rare. 



Tribe Panice^e. — Spikelets usually compressed dor- 

 sally ; terminal glume only bearing a flower. Not alpine. 

 Genera 2-4. 



2. Panicum, L. 



Glumes 4 ; pedicel of spikelet naked or hairy. 



P. gldbrum, Gaud. {Digitaria humifusa, Pers.) ; spike- 

 lets about 3, digitate, leaves and sheaths glabrous ; road- 

 sides, occasional. P. ciliare, Koel. ; leaves and sheaths 

 hairy, empty glume ciliate ; road-sides, local. P. sangui- 

 nale. Scop. ; similar, but empty glume not ciliate ; road- 

 sides. P. Crus - Gain, L. (Echinochloa Crus - Galli, 

 Beauv.) ; spikelets in racemes or panicles, glumes awned ; 

 road-sides, common. P. undulatifolium, Ard. {Oplis- 

 menus undulatif alius, Beauv.); leaves broad, stem and 

 leaf-sheaths with long hairs ; Ticino. 



3. Setaria, Beauv. 



Glumes 4 ; pedicel of spikelet with stiff bristles. 



6". viridis, Beauv. ; bristles clustered, scabrid ; road- 

 sides. ^. verticillata, Beauv. ; bristles single or in pairs, 

 barbed ; road-sides, rare., 6". glauca, Beauv. ; spikelets 



