24 
CLVII. GRAMINE^E (Stapf). 
Florets heteromorphous ; the lowest 2 barren, the fol- 
lowing spike lets large in a simple or at the' base 
slightly compound loose spike, curling up into a 
ball at maturity and falling entire ... ... 158. Entoplocamia. 
Spikelets generally in loose more or less open, rarely nar- 
rowly spike-like or racemiform panicles ; valves 
membranous to herbaceous, mostly 5-nerved. 
Leaves flat, more or less lanceolate, often broad with 
numerous transverse veins between the rather dis- 
tant nerves ; spikelets many-flowered, in loose 
open compound panicles ; glumes and valves sub- 
herbaceous. — Sub-tribe Centothecince ... ... 159. Centotheca. 
Leaves more or less linear, narrow without transverse 
veins. 
Valves keeled, generally rather broad, ovate or ob- 
long, often obtuse and with broad and varie- 
gated hyaline margins or tips, awnless ; florets 
often with a tuft of curled wool at the base. — 
Sub- tribe Poince ... ... ... 160. Poa. 
Valves rounded on the back or keeled upwards, her- 
baceous to chartaceous, usually acute or acu- 
minate, often more or less mucronate or awned 
from the entire or 2-toothed tips, rarely from 
below the tips. — Sub-tribe Festucince. 
Spikelets panicled. 
Florets more than 1 to many. 
Valves subulate-lanceolate, rounded on the 
back, passing into a straight often long 
awn, 5-nerved ; glumes generally very 
unequal or the lower absent ; panicle 
contracted, usually secund ; annual ... 161. Vulpia. 
Valves lanceolate to broadly oblong ; glumes 
rarely very markedly unequal. 
Valves lanceolate, rounded on the back or 
keeled at the tips, 5- rarely 7-nerved ; 
mucro or awn, if present, terminal, 
straight; styles terminal or subterminal 
on the glabrous or hairy ovary-top ... 162. Festuca. 
Valves lanceolate to broadly oblong, 
rounded on the back or keeled, 5-9- 
nerved ; aAvn, if present, close to or 
somewhat distant from the often 2- 
toothed tip ; styles lateral on a hairy 
2-3 -lobed appendage of the ovary ... 163. Bromus. 
Floret 1 ; valve lanceolate, 3 -nerved, awn from 
close to the tips, straight ; ovary-top 
Villous 164. PSEUDOBROMUS. 
Spikelets subsessile in a simple spike-like raceme ; 
valves oblong to oblong-lanceolate, 7-nerved, 
usually awned or mucronate from the tip ... 165. Brachypodium. 
Tribe XVII. HORDEiE. — Spikelets sessile, singly or in dusters on the notches 
of a simple spike, sometimes partially sunk in hollows of the same. Florets 
1 or more. 
Spikelets solitary at the nodes of the spike. 
Spikelets with their median plane radial to the rhachis ; 
lower glume if present contiguous with the rhachis. 
Florets 3 to many : valves herbaceous to charta- 
ceous, 5-7-nerved... ... ... 166. Lolium. 
