Angiosperms - Research Article from Macmillan Science Library: Plant Sciences

This encyclopedia article consists of approximately 8 pages of information about Angiosperms.
This section contains 2,201 words
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Origins of Angiosperms

Because of the sudden appearance of a diverse array of early angiosperms in the fossil record, Charles Darwin referred to the origin of the flowering plants as "an abominable mystery." Although there are reports of earlier angiosperm remains, the oldest fossils that are indisputably angiosperms are from the early Cretaceous period, about 130 million years ago. Based on fossil evidence, it is clear that angiosperms radiated rapidly after their origin, with great diversity already apparent 115 million years ago. By 90 to 100 million years ago the angiosperms had already become the dominant floristic element on Earth. By 75 million years ago, many modern orders and families were present.

The closest relatives and ancestor of the flowering plants have long been topics of great interest and debate. There was widespread belief during the last decades of the twentieth century that the Gnetales, a group of gymnosperms having three existing, highly divergent...

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This section contains 2,201 words
(approx. 8 pages at 300 words per page)
Buy the Angiosperms Encyclopedia Article
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Macmillan Science Library: Plant Sciences
Angiosperms from Macmillan Science Library: Plant Sciences. Copyright © 2001-2006 by Macmillan Reference USA, an imprint of the Gale Group. All rights reserved.
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