IO52 ANALYTICAL KEY 



2 1 z 1 Fl. glume membranous; seed not beaked. 



MOLINIA. 



20 Panicle open : CATABROSA. 



uu Fl. glumes 5-many-nerved; e.g.<spk. (excepting in Savas- 



tana}. 

 v Palet with the keels winged or appendaged; fl. glumes 



broad, truncate or erose at apex PLEUROPOGON. 



w Palet without wings or appendages. 

 w Fl. glumes more or less strongly compressed and keeled. 

 x Empty basal glumes 3-6; spikelets very flat and broad, 



ovate-oval, 15-35 mm - l n g UNIOLA. 



xx Empty glumes only two. 



y Ligule a ring of hairs; spikelets dioecious. .DISTICHLIS. 

 yy Ligule scale-like. 



2 Spikelets regularly spiked; fl. gls. awned. . (SECALE.) 

 zz Spikelets in an open or dense panicle. 

 2 l Empty glumes equaling or exceeding the spikelet. 



SAVASTANA. 



z'z 1 Empty glumes shorter than the spikelet. 

 z 2 Glumes short-awned, 5-6 mm. long; spikelets 

 fascicled at ends of stiff rays of interrupted spike- 

 like or open panicle; green or purple. DACTYLIS. 

 Z 2 z 2 Glumes awnless. 



z 3 Silvery shining condensed panicle; no cobwebby 

 hairs on keel of thin fl. glumes; spikelets 



2-5-fld KOELERIA. 



2 s z 3 Not silvery shining; panicle rarely condensed. 

 z 4 Hairs at base of y-nerved fl. glume glandular. 



DEMAZERIA. 



z*z 4 Hairs at base of 5-nerved fl. glume cobwebby. 



POA. 

 (Some species of Bromus have glumes slightly 



keeled.) 



ww Fl. glumes rounded on the back. 

 x Spikelets regularly spiked, one spikelet at each node, 



placed with its side to the axis. 



y Fl. glume deciduous at maturity and with a distinct 

 callus which is limited by a furrow at the base. 



AGROPYRUM. 



yy Fl. glume persistent at maturity and without a callus. 



(TRITICUM.) 



xx Spikelets paniculate. 



y Spikelets abruptly nodding on the pedicel ; empty glume 

 not much shorter than the spikelet; uppermost 



glumes empty MELICA. 



(See also Avena saliva, awnless varieties.) 

 yy Spikelets not abruptly nodding, 

 z Palet exceeding the lanceolate, acute fl. glumes. 



PANICULARIA. 



zz Palet shorter than the fl. glumes. 

 z 1 Nerves of the fl. glumes not converging above and 

 usually not reaching the scarious blunt or truncate 

 apex. 



z 2 Fl. glumes cordate at the apex, margin very 

 broadly scarious, outline nearly orbicular. 



BRIZA. 



Z 2 2 2 Fl. glumes not cordate at the base. 

 z 3 Fl. glumes plainly 5~7-nerved; style present. 



PANICULARIA. 



