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The Mexican Hedge nettle is a member of the mint family. Pojan and MacKinnon are inclined to believe that this same plant is also called Stachys cilata . Peck lists both. In any event, the leaves are of a lance shape moderately notched on the edges with purple flowers growing out of the joints between the leaf and the stem. As the plant matures it will develop a flower cluster on top. It appears on roadside ditches often intermixed with the stinging nettle. Plants 3 feet or so high.
Compared to the leaves the flowers are relatively small and other than their color are not particularly noticeable.
Additional information: see Wikpedia - Hedge Nettle