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Flowering plants

      The flowering plants (angiosperms), also known as Angiospermae or Magnoliophyta, are the most diverse group of land plants. Angiosperms are seed-producing plants like the gymnosperms and can be distinguished from the gymnosperms by a series of synapomorphies (derived characteristics). These characteristics include flowers, endosperm within the seeds, and the production of fruits that contain the seeds. The ancestors of flowering plants diverged from gymnosperms around 245–202 million years ago, and the first flowering plants known to exist are from 140 million years ago. They diversified enormously during the Lower Cretaceous and became widespread around 100 million years ago, but replaced conifers as the dominant trees only around 60–100 million years ago.

Source: http://en.wikipedia.org/wiki/Flowering_plant
Alnus gaudinii EK341
Alnus gaudinii EK337
Alnus gaudinii EK336
Alnus gaudinii EK328
Alnus gaudinii EK340
Alnus gaudinii EK335
Alnus kefersteinii MP145
Alnus ČB493
AlnusAD Bůžek (1971) ČB129
Alnus ČB495
Alnus ČB488
Alnus ČB490
AlnusBůžek (1971), Pl. 15, fig. 5 ČB83
Alnus ČB497
Alnus ČB492
Alnus ČB483
Alnus ČB491
Alnus ČB486
Alnus p1912
Alnus ČB496

Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]