<AREA SHAPE=RECT COORDS="64,13,79,31" HREF="!Cycad trees live only in warm, moist regions. They bear heavy cones that may grow 3 feet (91 centimeters) long.">
<AREA SHAPE=RECT COORDS="281,12,299,30" HREF="!Tree ferns are the only trees that have no flowers, fruits, or seeds. They reproduce by means of spores.">
<AREA SHAPE=RECT COORDS="472,14,490,31" HREF="!Ginkgo trees are a single species. They bear seeds but not fruits or cones. The seeds have an unpleasant odor.">
Trees can be divided into the six main groups illustrated here. All the trees in each group are similar in appearance and have other features in common.<NP>
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World Book illustrations by James Teason</P>
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