This picture shows a lateral meristem of a Lilac Tree. The lateral meristem is a meristem that is involved in secondary or hoizontal growth. A meristem is an area of undifferentiated cells where growth takes place. (1) There are primary and secondary meristems. Primary meristems give rise to primary growth, or vertical growth. Secondary meristems promote secondary growth, or horizontal growth.
Citations:
1. "Meristem." Wikipedia. Wikimedia Foundation, 26 Apr. 2012. Web. 28 Apr. 2012. <http://en.wikipedia.org/wiki/Meristem>.
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