CHAPTER XXIII 
THE DICOTYLEDONS 
The Dicotyledons are a class of angiosperms having the 
following characteristics: 
(1). Two-seed leaves (cotyledons) in embryo, these being 
lateral on the embryonic axis. 
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Fic. 371.—Morphology of a typical dicotyledonous plant. 4, leaf, pinnately- 
netted veined; B, portion of stem, showing concentric layers of wood; C, ground- 
plan of flower (the parts in 5’s); D, perspective of flower; E, longitudinal section 
of seed, showing dicotyledonous embryo. (Gager.) 
(2) Foliage leaves with pinnate-reticulate or palmate- 
reticulate veins. 
(3) Leaf blades varying from simple to lobed to compound 
-in pinnate or palmate fashion depending upon character of 
venation. 
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