LIZZIE HARPER / SCIENCE PHOTO LIBRARY LIZZIE HARPER / SCIENCE PHOTO LIBRARY
Plant comparison. Artwork showing an example of each of the two subclasses of flowering plants: a dicotyledon (left) and monocotyledon (right). These names are derived from the number of leaves that cover the seed, which is two and one respectively. The root system of a dicotyledon consists of a primary (tap) root with smaller secondary roots. A monocotyledon has fibrous roots. The leaves of the dicotyledon are usually broad, bear small paired appendages (stipules) at the base of the leaf stalk and have a radiating vein structure. In comparison the monocotyledon leaf has parallel veins and is oblong in shape.
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