Trees develop seeds as complete embryos with a food source and seed coat. There are four major groups of trees: ginko, cycads, gnetophyta, and conifers. There is only one species of ginko tree surviving today, the Ginko biloba, who’s seeds stink like the wrong end of a dog. The Ginko is interesting in the fact that there are male trees and female trees. The cycads all have fern-like leaves and tend to live amongst the tropics. Gnetophyta contains a number of varied forms, including ephedra which is good for colds. Lastly, and most recognisably, there are the conifers, which are the evergreens who have leaves like needles so they may continue to photosynthesize all year round without losing too much water.
Trees with needles or scalelike leaves and cones.
Perennial plants which are normally leafless for some time during the year.
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