| centimeter |
a unit of length in the metric system equal to about 2/5
inch in the English system. |
| hybrid |
a plant derived from two plants of different species; is
known to occur between species of the pondweed family. |
| lime |
calcium carbonate; a white, flaky substance often found on
aquatic plants. |
| leaflet |
a division of a compound leaf; they make watermilfoils
appear feathery. |
| macroscopic |
large enough to be observed by the naked eye. |
| meter |
a unit of length in the metric system, equal to about one
yard in the English system, or 39.37 inches. |
| microscopic |
indistinguishable without the use of a microscope; very
small or fine. |
| midrib |
the main or central vein of a leaf; see Figure
4b. |
| millimeter |
a unit of length in the metric system, equal to about 1/25
inch in the English system. |
| primary producer |
plants capable of manufacturing food from sunlight and
simple inorganic substances. |
| sheath |
the lower part of a leaf that surrounds the stem; often
visible on plants of the pondweed family; see Figure
4b. |
| stipule |
an appendage at the base of a leaf; see Figure
4b. |
| tuber |
a thickened underground stem important for vegetative
reproduction. |
| vascular bundle |
a network of cells found in higher plants for transporting
nutrients and water. |
| vascular plant |
a plant having a conducting system of vascular bundles for
transporting nutrients and water. |
| vein |
vascular bundle found in a leaf. |
