This section is from the book "The Home Cyclopedia Of General Information", by Charles Morris. Also available from Amazon: Home Cyclopedia of Necessary Knowledge.
[Gk.] A plant that grows by adding its new wood round the outside of the stem, under the bark, as is done by most forest trees of the temperate zones. The leaves are usually net-ted-veined, and the number of cotyledons is two, or very rarely several in a whorl. Exogens and endogens are the principal classes of the vegetable (q-v.) kingdom.
 
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