Botanical Words Alphabetical List - EX

EXALATE:Lacking wings or wing-like appendages; not alate.

EXALBUMINOUS: Without endosperm; applied to seeds. Also endospermous, exendospermic.

EXANTHEM: 1. A blotch on the surface of a leaf, etc. 2. A copper-deficiency disease of plants, prevalent in citrus and olive, and characterized by dieback and blotches on leaves and fruit.

EXCHANGEABLE: A term used to describe ions in the absorbing complex of soil that can be exchanged with other ions.

EXCHANGEABLE SODIUM: Sodium that is attached to the surface of soil particles and that can be exchanged with other positively charged ions in the soil solution.

EXFOLIATE: To peel off in layers or flakes, as the bark of certain trees.

EXOCARP: The outer layer of the covering of a fruit when it consists of two dissimilar layers.

EXOGEN: A plant in which the growth of the stem is in successive concentric layers, such as most trees.

EXOGENOUS: Growing by additions on the outside, such as the rings of a tree trunk.

EXOTIC: Of foreign origin or character; introduced from a foreign country or a different region. An exotic plant is one not native to the place where it is growing such as Japanese Honeysuckle, which has naturalized in the northeastern states, or Eucalyptus trees, which have been naturalized on the West Coast.

EXSUCCOUS: Dry, without juice, sap, or moisture; withered.

EXTRAFLORAL: Of a plant part that doesn’t form part of a flower.

EXTRORSE: Facing away from the direction of the growth (in reference to the anther of a flower).

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