366 WEEDS AND USEFUL PLANTS. 
Spikelets with more than o f the lower fiowers perfect. 
and palez 
§ 4. 4. Spikelets several- Lae to many-) flowered, often with the upper- 
Sopeecs eke nie loret imperfect or abortive,—usually 
Eee 
He 
pipes 
rea 
ES 
oa 
tyre 
a8 
P--3 
Fi 
ae 
Se 
th 
3 
pe 
i=j 
‘the 
nines 2 Feats er “long) and vine meg ae palea awn-pointed 
baceous, compressed-keeled. Panicle contracted in 
ided otistars 11, Dacryrs. _ 
Lower palea awnless and pointless. 
Lower palea rounded on the back, 5—7-nerved, scarious 
at the tip. Spikelets many-flowered, the rachis com- 
breaking into joi maturit 
— ae 
rved, t 
often per wah phate a Spikelets flattened. 13. Poa. 
Lower palea convex on the back, acute, sub-coriaceous, 
8-5-nerved, not paso gaty atl at ase 14, Festuca. 
rent to the 
wer pa 
below the 2-cleft tip, 5-9 be 15. Bromus. 
‘baceous, often tall and rr : 
Spi ikelets strongly silky we ed on the 
##% Culms woody, aulrticos icose or arborescen 
ned, loosely Bt Tatloweid 17. ARUNDINARIA. 
c do of eac 
joint), forming a pos Glumes Pein ea Bora or dea Eig 
Otherw: 4. 
eign 8 — at each joint of the rachis ; several-flow 
Glu , external. Spikelets placed edge’ wise on ie ha: 18, Lonicm. 
Giumes 2, ngs (right and left) ; spikelets placed flat- 
rachis. 
w Spikelets 3-—several-flowered. 19. TrrricuM. 
Spikelets 2-flowere 20, SECALE. 
Spikelets 2-4 at each joint of the rachis. 
ee 1-flowered, 3 at each joint, the 2 lateral ones usually 
21. HorpevM. 
arte. Spike veral-flowered, panicled ; the rac 
flowers oiten “illous bearded. bene mostly prone hel or exceed- 
ing the flo palea mostly bearing a twisted, bent or 
ight Zz i n its e pex. Sta 
e' 
Awn wich ri apsire from the sre a only, below the apex, 
. “asdeatnrnal tore ot Ieee rounded on the back. 22. AVENA. 
Oth 
—— os Laima — awaless ; the upper staminate and 
whed. Rudiments 24. Hoxcus. 
2. THE pee SvuB-TRIBE. 
Spikelets more or less panicled, 3-flowered, the uppermost or middle 
vested er perfec those igeareatr oe n each aoe Jey igre staminate, 
pane to an inconspicuous rudime 
neutral, each of a single Suen palea, the per- ‘ 
fect eae oe avalon with 2 stamens 25. ANTHOXANTHUM. 
Latoral lowers reduced to a small rudiment on each side of the 
, shining, flattened fertile one 26. PHALARIS. 
