The Essentials of Botany

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As we go back in geological time the vegetation is less and less like that of to-day. Thus, the higher flowering plants (Dicotyledons) were not in ex- istence earlier than the Cretaceous period, while the Lilies and their relatives date back to the Triassic. The great Carboniferous vegetation, from which our coal was derived, contained no plants with true flowers. There were no grasses or sedges, no lilies or orchids, no roses or violets, no CLASSIFICATION AND DISTRIBUTION.
103 r§ Recent.
■■g P
...liocene.
Miocene.
Eocene.
-a a 8 eg Creta- ceous.
Jurassic.
Triassic.
c5 1 o "3 Ah o r a Pli Permian.
Carbon- iferous.
Devonian.
( Gymnosperms.
• Monocotyledons.
Dicotyledons.
Silurian.
Protophyta.
Zygophyta.
OSphyta.
Carpophyta.
Bryophyta.
Pteridophyta.
Phanerogamia.
Fio. 43.— Chart sbowing distribution of plants in Qeological Time.
104 BOTANY.
oaks or maples. There were cone-bearing trees and tree- ferns, as well as gigantic club-mosses and horsetails; but even these were very different from any now living, 212.


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