GRAMINA. 
183 
pressure are easily dried flat, which it is difficult to do with those of 
T. pungens. The ribs of the leaves of T. acutum are also thickly 
covered all over with very minute asperities, not with a single row of 
large ones as we find in T. pungens. The spike is lax, and occupies 
a much greater part of the stem than in T. pungens. The spikelets 
are more closely applied to the rachis, usually longer and narrower in 
proportion. The axis of the spikelet is more distinctly puberulent, 
so as almost to deserve to be called minutely pubescent. 
The characters which distinguish T. acutum from T. junceum will 
be mentioned under that species. 
Perhaps T. pungens and T. acutum ought to be combined in a ver- 
species distinct from T. repens on account of the dilferent structure 
of the leaves. I have repeatedly endeavoured to raise our two 
maritime forms of Triticum from seed, but never could get it to 
germinate; as in many other extensively creeping plants, the seed 
appears to be but rarely perfected. 
I have followed Mr. Lloyd (" Fl. de I'Ouest de la France," ed. ii. 
p. 600) in joining T. pungens, Auct.^ campestre, G. Gr., and acutum, 
D.C., with T. repens, rather than Dr. Hooker ('^ Stud. Flora," p. 454), 
who considers them as subspecies of T. junceum, with which they have 
certainly far less affinity than they have with T. repens, but it would 
be highly desirable that they should be raised from seed, should any 
botanist on the coast be fortunate enough to obtain it. 
The figure which Reichenbach gives of "T. acutum," in the Ic. 
Fl. Germ. et. Helv. Tab. CXXII. Fig. 266,* appears to me to represent 
T. pungens; while that of A. affine, Tab. CXXI. Fig. 262, is a fair 
representation of T. acutum. 
Decumbent Sea Couch-Grass. 
SPECIES m— TEITICUM JUNCEUM, Linn. 
Plate MDCCCXHI. 
Eeich. Ic. Fl. Germ, et Helv. Vol. I. Tab. CXXII. Fig. 2Gr. 
Billot, Fl. Gall, et Germ. Exsicc. ^o. 
Buvnl-Jovvp, Mom. de I'Acad. de Montpelier, Yol. YII. p. ;590. 
Agropyrnm juncfum, Pal de B.aiu:; Gren. Gudr, Fl. de Fr. Vol. I. p. 604 Pari 
Fl. Ital. Vol. I. p. 502. 
^sot c£espiro.-<e. Rootstock extensively creeping, with long stolons. 
Stems solitary or loosely fasciculate, ascending or suberect, usually 
from a decumbent and geniculate base, firm, solid. Leaves firm, thick, 
narrowly linear, tapering to the apex, greatly involute especially 
towards the apex when fiKling or dry, with numerous thick very 
prominent slightly unequal contiguous cartihiginous ribs, each of which 
is very densely clothed with extremely >hort velvety hairs. Spike 
