intrinsic permeability A measure of the relative ease with which an earthen material can transmit a liquid. It is a property of the material independent of the nature of the liquid and the force causing movement.

introduced A term descriptive of a plant moved to a location where a plant of the same variety is not found. It could be moved across a neighborhood, town, county, mountain range, river, continent, or ocean. It appears that the only truly non-introduced plants are those that are growing where another identical plant type once grew. But, then, one wonders when the first plant of that type was introduced to that location.

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