in what era was the plant rose and in what period?

Question

is it the paleozonic era , and the cambrian period?

Answer 1

495 - 417 million years ago saw the first plant ancestors, psilophytes, on the land colonizing shorelines. This was the Silurian Period.
http://www.eurypterids.net/SilurianPlants.html
http://library.thinkquest.org/20886/silurian.htm
http://library.thinkquest.org/20886/psilophytes.htm