Evolutionary history of plants phloem on the outside. Since xylem cells comprise dead, lignified tissue, subsequent rings of xylem are added to those already present, forming wood. The first plants to develop secondary growth and a woody habit, were apparently the ferns, and as early as the Middle Devonian one species, "Wattieza", had already reached heights of 8 m and a tree-like habit. Other clades did not take long to develop a tree-like stature. The Late Devonian "Archaeopteris", a precursor to gymnosperms which evolved from the trimerophytes, reached 30 m in height. The progymnosperms were the first plants to develop true wood, grown from
Division of Kennedy Division of Kennedy The Division of Kennedy is an Australian Electoral Division in Queensland. The division was one of the original 65 divisions contested at the first federal election. It is named after Edmund Kennedy, an explorer in the area where the division is located in Queensland. The member since 1993 is Bob Katter Jr., the leader of Katter's Australian Party. He was previously elected as a member of the National Party, but became an independent in 2001 before forming his own party in 2011. Geographically, the electorate is rural. It takes in the Pacific coast of Queensland between Cairns