54 CLASSIFICATION 
to. Phleum. Panicle cylindric, dense ; flowering glume rarely 
awned ; when present, the awn is terminal. In some species the 
spikelet has a rudiment (fig. 18). 
( 11. AMzibora. Spikelets terete, minute, few in a simple spike 
fig. 28). 
12, Agrostis. Panicle usually spreading; flowering glume 
thin and colourless; palea absent in some species (fig. 23). 
13. Polypogon. Panicle dense ; empty glumes with long awns. 
The spikelets are articulated to the pedicel. 
14. Calamagrostis. Flowering glume with a tuft of hairs at 
its base on the rachilla. 
In the following genera the spikelets 
have a rudimentary glume or naked 
pedicel, above the bisexual flower : 
15. Gastridium. Base of each empty 
glume swollen into a round prominence, 
and ultimately indurated; flowering 
glume minute, hyaline. 
16. Afpera. Flowering glume with a 
long subterminal awn. 
17. Deyeuxia. Flowering glume 
with a tuft of hair at its base, and dor- 
sally awned. 
18, Ammophila, Panicle dense ; 
spikelets large, rigid; flowering glume 
with a tuft of hairs at its base, anda 
very minute subterminal awn. 
19. Lagurus, Empty glumes fringed 
with long silky hairs on the margins, 
and therefore plumose or feathery. 
Spikelets massed into an ovoid head ; 
flowering glume with a long dorsal and 
Hie tesa _, two terminal awns. 
eenialencine Fare pa el The genera Calamagrostis, Deyeuxia 
ed); lower figures enlarged—the and Azzmophila are closely allied, and 
left a spikelet, the right same, these again are nearly related to Agvos- 
minus empty glumes to showdor- ,. : 
sally awned flowering glume. dts. In the last named there is not a 
decided ring of hairs at the base of 
the flowering glume, nor is there any rudiment. 
Tribe AVENE. Spikelets containing two or more flowers, and 
often a terminal rudiment; flowering glume with a bent and twisted 
awn on the back. The distinctive tribal character is the dorsal 
awn which, in the lower part below the bend or knee, is spirally 
twisted. The following genera, with the exception of Azra, have 
a terminal rudiment or empty glume, and there is often a tuft of 
hairs at the base of the flowering glume. ; 
Genus 20. Azra. Flowers two, bisexual ; no rudiment. 
21. Corynephorus. Awn jointed in the middle, and thickened 
towards the tip (club-shaped). 
22. Deschampsia. Awn short, nearly straight (fig. 37). 
