LXXXIX, GRAMINEZ. 5OD 
Spikelets 2 lines or less. Awn fine, scarcely protruding beyond the glumes. 
17, AIRA. 
Spikelets 3 or 4 lines long, Awn exserted, One of the flowers male only, 
19, ARRHENATHERUM, 
Awns quite or very nearly terminal, sometimes reduced to a very short point 36 
85) Membranous ed edges of the glumes projecting in 2 ain i Son the base of the 
awns ., P 30, BROMUS. 
36 | { Spikelets crowded in a close spike or dense clusters . ° ° . 37 
\ Panicle loose or contracted into a long one-sided spike . . ‘31. Frsrvca, 
37 ae spikelet of each cluster consisting of empty glumes only 33. Cynosurus, 
All the spikelets containing flowers. : » 382, Dacrytis. 
soe terminal awnless flower and a lower male flower awned . 3. PANICUM. 
38 Awnless flower the lowest, with a terminal awned male one . . 39 
“Outer glumes 2 to 3 lines, completely enclosing the flowers and their awns. 
39 20. Houcvs. 
Outer glumes 8 to 5 lines, the flowers or at least their awns protruding. 
19, ARRHENATHERUM. 
Spikelets 2- or more flowered, awnless, panicled or in a compound spike, 
Spikelets 2 or 3 together to each notch of an apparently simple spike. 
25, ELYMUS. 
40, Spikelets sessile, in close clusters in an appaseney simple spike or spike-like 
panicle . ° ° . 4i 
| gbanicle more or less stalked, in a loose or contracted panicle : ; » 43 
A small bract at the base of the spikelets or clusters A . Al. SESLERIA, 
41 14 Ontor spikelet of each cluster consisting cf empty glumes . 33. CYNOSURUS. 
Spikelets all containing flowers without bracts at the base of the clusters . 42 
Spike cylindrical or poebily interrupted. Flowering glumes white and mem- 
branous . . . 40, Ka@:LERIA. 
“ lusters oe sided, in an ‘irregular spike or ‘close panicle. Glumes herbaceous 
andrigid . ° 4 ut. 10a. DA CTS are 
ne glumes enclosing ‘the flowers or nearly 80 . ° : ° ° ; 
{ Outer glumes shorter than the flowers : 45 
Glumes obtuse, coloured. Two flowers with a wedge- shaped ‘rudimentary 
glume . . 38. MELICA. 
Outer glumes very acute. About 3 flowers in the spikelet, all perfect, with 3- 
toothed glumes . 39, TRIODIA, 
Glumes all acute. Two male flowers and i smaller perfect one in the spikelet. 
4, HIEROCHLOE, 
{ca outer glume very small, second broadly truncate at the we, and often 
coloured. Flowers 2 in the spikelet - . 36. CATABROSA. 
{ cal outer glumes pointed or obtuse, not truncate. Flowers usually 3or more 46 
Spikelets broadly ovate or orbicular. Glumes closely packed and very spread- 
46 ing. “ . 4 . - . : ~ . 934 Briza. 
. Spikelets oblong orlinear . ; : : . 47 
47 Flowering glumes rounded on the back, at least at the base . - - . 48 
aaiguerng glumes keeled on the back . ° : . . . . - 49 
48 Flowering glumes obtuse or rather acute . ° : . ° 35. Poa. 
Saslactinis glumes very pointed or shortly awned 31, FESTUCA. 
- (Flowering glumes very pointed. Flowers about 3, with a pristle-like continua- 
49 | tion of the axil . 37. MoLINIA, 
Flowering glumes obtuse or acute. Flowers 3 Or ‘more, the last terminal 35. Poa. 
The limits of the numerous genera into which Grasses are divided are 
as yet far from being definitely fixed. Some are by no means natural, and 
those which are so have not always any definite characters. They have 
also been variously distributed into tribes, according to the special views 
of their structure entertained by different botanists. Amongst those 
which appeared to be the most generally adopted, eight tribes were, in the 
first editions of this work, distinguished as being represented in Britain, 
Since then a detailed study of a considerable part of the Order, in connec- 
tion with the Australian Flora, has suggested some modifications in the 
general grouping of the genera, but as the new tribes cannot yet be con- 
sidered as definitely settled, the sequence adopted in the first edition is here 
