Leaves. Collect the leafy stems of many kinds of plants. Ob-
serve the arrangement of the leaves on the stems. A few like Erodium
(Filaria), the Catchfly, Pink, Fuchsia, Mint, etc., have Opposite leaves.
Possibly you may find a Collinsia, or stem of Cleavers, with the leaves in
Whorls of three or more. Most plants have Alternate leaves. You will
find some plants like Plantain, with a bunch of leaves growing from the
ground, but no leafy stems. Such leaves come from rootstocks, and are
said to be Radical. Plantain, Dodecatheon, Primrose, etc. have the leaves
all radical. Many perennial herbs have radical leaves, as well as ordi-
nary stem leaves, and these usually differ more or less from the stem


leaves.
Observe that stems and branches end in buds or flowers, and that


Xxv1 INTRODUCTORY LESSONS.
there is usually a bud, or branch, or a flower at the base of a leaf be-
tween it and the stem from which it grows. _

Buds and flowers at the ends of stems or branches, are Terminal ;
when between the stems and leaves, Avillary.
