157 
Trine XII.—HORDE®. 
Spikelets 1- to many-flowered, usually hermaphrodite, sessile 
along the common ab ee forming a simple or compound spike;! 
pone awned or awnles 
_ A small tribe of 20 genera and about 130 species. It 
is an important division, however, for it includes rye, 
barley, and the many varieties of whéat. English and 
Italian Rye-grasses enn species) are the chief 
meadow grasses of the tri 
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KEY TO THE GENERA OF THE HORDE. 
. Spikes slender, reonoase bis At Aes 1- cage ered, raped glume 1, 
very small and grown to the rae 126. Narpus 
Spikes not chiaiers 1 2 
Spikelets solitary at each joint of the rachis ! 
Spikelets 2 to 3 at each joint of the rachis 8 
+ 
5 
kes very slender; spikelets 1- or 2-flowered z 
Spikes stout; spikelets usually 2- or more-flowered......__- 
Flowering glume awned 129, ScrIBNERIA 
Flowering glume awnless 128. Leprurus 
cassie placed with one edge a tag the rachis; outer empty 
lume 1 (in the terminal spikelet 2) _.._..... 127. Lotium 
5 garnet -somati with their sides saxioud the rachis; empty 
6 
glum 
“cio glumes with a distinct callus at the base, pas at 
maturity with the grain, which is adherent to the p 
es 
30. 
. Flowering glumes without a distinct callus, persistent; grain 
free : fy 
Empty glumes subulate, 1-nerved at. SECALE 
Empty glumes lanceolate or ovate, 3- to many-nerv: 
132. ‘een, 
: Spikelets 3 at each joint of the articulate rachis, 1-flowered 
with a bristle-like prolongation of the rachilla behind the 
palea at least in the central spikelet...._..- 133. Horprum 
nd us eam = a oo ae of the rachis, with 2 or more her- 
9 
. Empty glumes minute or none _..-_-........ 136. ASPERELLA 
. Empty glumes usually eating se —— glumes... _. 10 
Pep | 
Axis of the spike conti 
~~ glumes 
entire . Etymts. 
i of the ‘pike articulated ina readily ‘cae up; empty 
— suai 2- to bent R embers or cleft.... 135. Srrantoy 
“haseis is 1-fi d, and 
ito wna more than 1-flowered. 
