THE LEAVES. 65 
tended, there are formed the internodes.'. The parts of the 
stem bearing the leaves are thus called the nodes, These are 
occasionally swollen (Polygonacee, Piperacee, and the grasses). 
The place of attachment of the leaf is called the point of inser- 
tion.” According to the distribution of the leaves on the stem, 
there are distinguished the spirally arranged (Chenopodium), 
crossed or decussate’ (Labiate), and whorled leaves (Juni- 
perus). 
The stalked leaves admit of the distinction of the leaf-stalk or 
Fig, 2.—Leaves of Eucalyptus globulus Labill. (Heterophylly). a, sabre-shaped 
leaf of an older branch; }, heart-shaped leaf of a younger branch. The oil cells are 
indicated by dots. (Tschirch, in Pharm, Zeitung, 1881, No. 88.) 
petiole ( pefiolus) and the leaf-blade or lamina; * on the boundary _ 
of both these parts there often appears a small membrane or | 
ligule (ligula). The base of the leaf-stem is often ea Bo 
* Inter, between, and nodus, node or joint. 
_ ? Inserere, to insert. 
* Decussare (decussio = the number ten), to divide in form of an x 
(i. e. , crosswise), 
. Lamina, : thin plate. 
