DISTRIBUTION OF FESTUCA RUBRA IN BRITAIN, 323 
have a very definite liking for calcareous soils. In the Alps, where it covers 
wide stretches according to Schroeter (1908, p. 294), it is found on all soils. 
Hackel’s var. planifolia is very rare. It seems to fit in more readily under 
genuina since it materially differs from the forms of the latter only in its flat 
radical leaves. 
All Hackel’s forms of genuina occur in this country. There is much to be 
said in favour of considering these forms as distinct and regarding them as 
true varieties. So far as experiment has gone they breed true and remain 
so under cultivation. They obey very definite laws as to their distribution, 
and remain distinct even though occurring together in the same habitat, or 
in the same locality but on different soils. Further experiment is being 
done to test this for all the forms, but it is certainly true regarding some 
of them. (Howarth, 1920.) 
To show how in a general way these forms hang together the following 
table has been arranged :— 
vulgaris. 
(Sub-cæspitose ; foliage 
green, glumes smaller, 
smooth, no “ bloom.") 
glumes larger. 
grandiflora, 
a) 
= S 
8|. E 
cQ -. n © 
~ = = . + 
Ep] a © EA a 
als 21 ap 
= |= fE = 
> T " elz = leaves 
a x = 
E EE a s flat. 
= ze afz planifolia. 
n = E: = 
o c = = un 
= m — 
3 21 | 
3 
4 
= leaves stout, 
sea-green. 
tenurfolia, juncea. 
? glaucescens 
or pruinosa. 
EE 
a 
2 | | 
a |: 
== glumes 
CN . 
ajs hairy. 
arenaria. 
dumetorum. true glaucescens. 
