46 
LEAVES. 
with a serrulated or slightly notched margin ; at 6, may be seen the cleft stipulei 
or appendages of the leaf. 
/. Linear, as the grasses and Indian corn (Fig. 40, c) ; this leaf is sheathing, or in- 
closes the stem by its base, as may be seen at d. Here the veins do not spread 
out, but run from the base to the apex with a narrow strip of parenchyma. 
ff. Deltoid, from the Greek letter delta, a ; the Lombardy poplar, e, affords an 
example of the same. 
h. Sagittate (from sagitta, an arrow, 
Fig. 41, a); the Sagittaria, an aquatic 
plant, affords an example of this leaf. 
The acute lobes are prolonged down- 
ward. 
i. Acerose, or needle-shaped (Fig. 
41, 6). Leaves of this kind are mostly 
clustered together, as in the pine; 
they are subulate, rigid and evergreen. 
Trees with acerose leaives are usually 
natives of mountainous or northern 
regions ; any other kind of leaves 
would, in these situations, be over- 
powered by the weight of snow, or 
the violence of tempests ; but these 
admit the snow and wind through 
their interstices. Their many points 
and edges, presented even to a gentle 
breeze, produce a deep solemn murmur in the forest 
abroad and the tempest high, 
" The loud wind through the forest wakes, 
With sound like ocean's roaring, wild and deep, 
And in yon gloomy pines strange music makes." 
Burns, in describing such a scene, says : " This is my best season for 
my mind is wrapt up in a kind of enthusiasm to Him who * walketh on 
of the wind,' " 
j, Pinnatijld (Fig. 41, d) ; this 
is a feather-veined leaf; when 
finely divided like the teeth of a 
comb, such leaves are said to be 
pectiiiate. 
k. Lyrate (Fig. 41, c) differs 
from pinnatifid in having its ter- 
minating segment broader and 
more circular. 
I. Palmate, or hand-shaped (Fig. 
42, a) ; as in one species of the 
passion-flower {Passijlora cceru- 
lea. The oblong segments like 
fingers arise from a space near the petiole, which may be considered as 
to the palm of the hand. j 
m. Digitate, or fingered leaf 
(Fig. 42, 6), differs from the palmate 
in having no space resembling the 
palm of a hand ; but several dis- 
tinct leaflets arise immediately 
from the petiole, as may be seen 
in the horse-chestnut. 
n. Connate (Fig. 42, c), when 
the bases of opposite leaves are so 
united as to appear one entire leaf. 
o. Lohed is when leaves are 
and when the storm ii 
devotion : 
the winga 
analogous 
e. Lanceolate—/. Linear—^. Deltoid— A. Sagittate— t. Acerose —j Pinnatifid —A. Lyrate—/ PBt 
mate — m. Digitate — 71. Connate — 0. Lobed. 
