Instead of making their appearance singly and successively, and passing imperceptibly one into another, all three groups of Vascular Cryptogams, and the Gymnosperms into the bargain, come on the stage together, in the Devonian strata; and monocotyledons in the lower Carboniferous immediately following.
"The Old Riddle and the Newest Answer"
John Gerard
Cycads are extremely rare, and of monocotyledons there are but few.
"The Student's Elements of Geology"
Sir Charles Lyell
Humboldt and Bonpland found, among the unquestionably indigenous plants of tropical America, monocotyledons only, all the dicotyledons of those extensive regions having been probably introduced after the colonization of the New World by Spain.
"The Earth as Modified by Human Action"
George P. Marsh