51 
Series B.—POACEZ. 
Spikelets 1- to many-flowered, the imperfect or rudi- 
mentary flower, if any, usually uppermost; rachilla 
usually articulated above the empty glumes, so that 
these remain after the fall of the fruiting glumes.’ In 
spikelets with two or more flowers these are separated 
py a manifest internode of the rachilla, and in such 
cases the ate is usually articulated below each 
flowering glum 
In this ied grand division of the Graminex the 
pedicels are not (or very rarely) articulated below the 
outer glumes but the axis of the spikelet is articu- 
lated above these glumes, so that they usually remain 
attached to the pedicel after the falling off of the mature 
florets. The spikelets are one- to many-flowered, and 
have as many flowering glumes as there are flowers; 
the imperfect flowers, when present, are the upper- 
most; the terminal floret may be staminate or rudi- 
mentary. 
KEY TO THE TRIBES IN SERIES B.—POACEX. 
1. Spikelets 1-flowered, with or without a simple continuation of 
the rachilla behind the palea 2 
Spikelets two- to many-flowered 5 
ag 
2. saeny crowded in two (rarely one) rows along one side of a 
ontinuous rachis forming unilateral spikes, these scattered 
=~ common axis or digitate at the apex of the 
ribe X. CHLoRIDE®. (See page 97) 
eee not disposed in unilateral spikes 3 
te 
ad 
Inflorescence pases the spikelets sessile on alternate teeth or 
notches of the rachis... Tribe XII. HorpEx. (See page 157) 
ally contracted and spike-like, or condensed and apparently 
capitate; spikelets always distinctly pedicellate + 
4. Glumes five, the first four empty or (in Savastana) the third 
and sometimes the fourth, which are usually very unlike the 
first and second, with staminate flowers; the fifth glume with 
a ruseoa iin flower, and nem with the died and fourth; 
palea 1-nerved..... Tribe VII. Poatarmpex. (See page 53) 
xe Alopecurus, Cinna, Polypogon, Spartina, Beckmannia, Limnodea, and Holeus 
the rachilla is articulated below the empty pikelets 
