IO52 ANALYTICAL KEY 



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



Molinia. 



zz 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. 

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

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



ovate-oval, 15-35 mrn - l° n g Uniola. 



xx Empty glumes only two. 

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

 yy Ligule scale-like, 

 z Spikelets regularly spiked; fl. gls. awned. . (Secale.) 

 zz Spikelets in an open or dense panicle. 

 z 1 Empty glumes equaling or exceeding the spikelet. 



Savastana. 

 zV 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 Silven- shining condensed panicle; no cobwebby 

 hairs on keel of thin fl. glumes; spikelets 



2-5-fld , Koeleria. 



z % z z Not silvery shining; panicle rarely condensed. 

 z* Hairs at base of 7-nerved fl. glume glandular. 



Demazeria. 

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



Poa. 

 (Some species of Bromus have glumes slightly 

 keeled.) 

 vnv 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; uppermo: 



glumes empty Melica 



(See also A vena sativa, 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 an 

 usually not reaching the scarious blunt or truncat 

 apex. 

 z 2 Fl. glumes cordate at the apex, margin ve: 

 broadly scarious, outline nearly orbicular. 



Briza 

 z^z 2 Fl. glumes not cordate at the base. 

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



Panicularia 



