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358 ON TRITICUM PUNGENS. 
Triticum pungens, Koch. If his day lies among shifting sandy banks 
and dunes, along slopes of light poor littoral pasture, our expectation is 
that he will gather Triticum acutum . For, asa rule, the latter - 
erect habit of pungens and the more procumbent growth of acutum, 
either leads each plant to select: such habitats respectively, or is the 
result of each sub-species having grown for many generations under 
such a difference of physical conditions.* 
Ano : I. pungens isa more densely gregarious plant than 
its congener. If you can see ahead an actual waving corn-field (as 
it were) of sea-7Zriticwm, it will certainly prove 7. ns. I. acutum 
is gregarious also after its fashion, but it likes sufficient elbow-room 
for its stalks, and its individuals are sprinkled about, over large tracts 
often, at regular intervals of a few inches, but never as close as a crop 
of grain. For, growing as it does with its head closer to the ground, 
and with a spike, too, which presents a much narrower and more 
: ng 
shallower ribs upon their upper surface. Over these ribs small as- 
and below it. Again, a bed of old mussell-shells supplied some excellent spect 
ut, w i ink th iffe 
ra 
kind of place these two grasses select, the littoral section of Sclerochloa as 0 
growing with pungens, and Ammophila as often growing with acutum. 
. . ” 
+ Those who wish to study Triticum under its “caractdres anatomiques 
should at once consult the admirable papers of M. Duval-Jouve, whose chief 
* - d in ee a bs 
:onograp Agropyrum is containe Vol. vii. of the ‘‘ Mémoires de P’Aca- 
démie de Montpellier.” It would be bey the scope of paper, intended 
ainly to guide the field-botanist, if we attempted to follow him into c 
which lie beyond the reach of a collector's lens of fair power ; though doubtless 
the ny of the fu ec more a ore microscopic im 
botanists, with Dr Syme and Prof Babington a eir head, /ook down upon 
a icum leaf, and draw characters from o-ordination of asperiti alo 
alternate with fair regularity ; and his : be or" 
; : > ) plates present us with vertical secti 
the leaves of the leading sub-species in thie group, beautifully executed an@ 
ee a ae 
AGE a ee Poe tee, a eS 
Ts the co-ordi m 7 
1-Jouve disregards such characters (and in many spec — 
