106 CLASSIFICATION ACCORDING TO (cm 
* Upper flower perfect, lower staminate only. Tall oat- 
like meadow-grass, with a bent and twisted dorsal awn 
to the outer palea of the lower flower: silky hairs at 
the base of palee. 
Arrhenatherum avenaceum, Beauv. 
The grasses most like this are species of Avena and Aira. 
The former have two or more perfect flowers, and the only 
broad-leafed Atra—A. cespitosa, see p. 117—is easily distinguished 
by its leaves and its very small spikelets and short simple awns. 
** Upper flower staminate: lower perfect. Small hairy 
grasses, with red-veined basal leaf-sheaths and short 
simple awns. 
Holcus. 
+  Lrect, evenly hairy, glumes blunt, awn not pro- 
truding. Common. 
Ff. lanatus, L. 
tt More or less procumbent, hairs chiefly at the nodes. 
Glumes pointed. Awns simple and exserted. Rarer. 
HI. mollis, L. 
B. Each spikelet with at least two perfect flowers, 
often more. 
(1) Inflorescence spikate, the main axis bearing sessile 
or sub-sessile spikelets, each containing three or 
more flowers. 
(a) Spike simple, axis stout and notched, each 
notch having one spikelet closely sessile in it. 
(i) Spikelets distichous, the flat side of each—i.e. the 
edges of the glumes—being next the axis (rachis). 
Agropyrum. 
* A weed with creeping stolons, and no awns 
or mere points to the glumes. 
A. repens, Beauv. 
1 See note, p. 87. 
