Glossary of W...

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warm temperate climate (n.): No month below 6ºC. Usually:; Temperate forest on western and eastern margin.; Steppe in continental regions.; See also climate.
warm temperate zone (n.): The difference between the summers and winters is clear. Nights are cool. Vegetation chiefly evergreen.
watershed (n.): The area that supplies water to a river and its tributaries or to a lake. Where the area is well vegetated, the ground cover slows the flow of rainwater over the surface, allowing the water to sink into the ground without causing erosion.
weed (n.): A religious designation, often for a native plant in a garden of alien plants. A plant that thrives where humans do not want it. Often, it is a plant that colonizes disturbed areas vigorously.
whorl (n.): A circle of three or more structures radiating outward from the same node. For example, pines, spruces, and firs produce a terminal stem called the leader and a major whorl of lateral limbs at the base of the leader each year. A node is the place on the stem of the tree where these limbs in the whorl attach.
wing (n.): A paper-thin flat margin that borders a seed capsule. Likewise, for such an edge of a stem or flower.
winter annual (n.): A plant whose seeds germinate in late summer and that flowers and fruits in the following spring and summer (compare summer annual).
wooly (n.): Having soft, short hairs.

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