It moves through a layer in the stem and trunk called xylum. The other kind of sap is water carrying dissolved plant foods. It moves from the leaves to parts of the plant where it is to be used or stored. This sap moves in a layer called the phloem. The sap of many plants is valuable to man.
Most sugar sold in stores is made from the sap of sugar cane.
The sugar maple is also a source of sugar and syrup. Plants contain other liquids that are not true saps, in the botanical sense. The milky juice of milkweed is an example. The milky juice of rubber trees becomes the raw material for natural rubber. Gums and resins also are valuable plant juices.