THE LEAF 231 
Strong and thick veins are called bs and less prominent ones, 
especially if lateral to the midrib, nerves. 
FuRCATE- or FoRKED-VENATION is characteristic of leaves of 
the Ferns. 
3 
6. 
2. Parallel (Convallaria), 
(Drawing by Canis.) 
5. Palmate-reticulate (Acer). 
1. Furcate (Botrychium, a fern). 
4. Pinnate-reticulate (Castanea). 
Pinnate-reticulate with marginal veins anastomosing (Eucalyptus). 
Toa 
Fic. 159.—Leaf venation. 
Pinnately-parallel (Musa). 
PARALLEL VENATION is typical of the leaves of Monocotyledons, 
as Palms, Lilies, Grasses, etc. In this type of veining the veins 
visible to the unaided eye extend in somewhat parallel fashion 
through the leaf, converging near the summit. In pinnately- 
parallel veined leaves, as the Banana and Calla Lily, parallel 
veins extend from midrib to margin. 
