OF THE LEAVES OF CERTAIN SPECIES OF VERONICA. 259 
glaucous. The mesophyll seldom shows a differentiation into palisade and 
spongy tissues, but is in most cases very homogeneous. The bundles end 
simply and not in hydathodes. Stomata occur on both surfaces. Except 
when specially mentioned the bundles are embedded. 
V. Godefroyana, Carr. 
The leaves are thick, acute, and glaucous, also quite glabrous. In section 
the layers of mesophyll cells next the upper epidermis are more elongated 
and have more chloroplasts, but otherwise there is no differentiation. 
V. pinguifolia, Hook. f. *. 
The leaves are spoon-shaped, obtuse and glabrous. The whole mesophyll 
consists of slightly elongated cells, which have more chloropiasts towards the 
upper side. 
V. buxifolia, Benth. 
This species is like V. pinguifolia, but the leaves are softer and broader. 
The mesophyll is like that of V. Godefroyana, but is more completely palisade- 
like. The axillary bud is in a recess formed by the hollowing out of the stem 
and leaf-base. Native material has the outer walls of the epidermis more 
thickened than has the material grown in this country. 
V. Menziesii, Benth. 
о 
B 
The leaves are smaller, 2 xi in. The stomata оп both sidesare sunk. The 
mesophyll is very homogeneous, consisting of square or rounded cells with 
few interspaces, except close to the lower side. The central bundle is trans- 
current, being connected to the epidermis above and below by a small patch 
of thickened cells. Cork does not appear at the leaf-base till periderm 
formation commences on the stem. 
V. Colensoi, Hook. f. 
The leaves are smaller than in the preceding species, and glaucous, 
with the outer thickenings of the epidermis more developed. The mesophyll, 
both in cultivated and herbarium material, is like that of V. pinguifolia. 
Cork appears early at the leaf-base. 
V. glaucophylla, Cock. 
The leaves are larger and very glaucous ; the outer walls of the epidermal 
cells are much thickened and cuticularized. Stomata occur in greater 
numbers on the upper side. The mesophyll is quite homogeneous (fig. 11) 
* Bot. Mag. t. 6147. 
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