Your idea that dicotyledonous plants were not developed in force until sucking insects had been evolved seems to me a splendid one.
"The Life and Letters of Charles Darwin, Volume II (of II)" by Charles Darwin
Dicotyledons, Heer on oldest known.
"More Letters of Charles Darwin Volume II" by Charles Darwin
This will bring up the terms dicotyledon and monocotyledon.
"Outlines of Lessons in Botany, Part I; From Seed to Leaf" by Jane H. Newell
In this march I observed one or two instances of the absolute enclosure of Dicotyledonous trunks by Fici.
"Journals of Travels in Assam, Burma, Bhootan, Afghanistan and TheNeighbouring Countries" by William Griffith
Under the dicotyledonous groups, there are no plants with simplicity of floral elements.
"Scientific American Supplement, No. 623, December 10, 1887" by Various
With these there occur a few disputed leaves, which I must persist in regarding as dicotyledonous.
"The Testimony of the Rocks" by Hugh Miller
Debey, Dr., of Aix, on cretaceous dicotyledons, 133.
"Principles of Geology" by Charles Lyell
He separated flowering from flowerless plants, and divided the former into Dicotyledons and Monocotyledons.
"Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 3" by Various
CLASS I. DICOTYLEDONES ANGIOSPERMEAE, called for shortness in English, DICOTYLEDONS or DICOTYLS.
"The Elements of Botany" by Asa Gray
And, here again, there is no vestige of intermediate species, linking dicotyledonous plants with other types.
"The Old Riddle and the Newest Answer" by John Gerard