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Northern willowherb (Epilobium ciliatum) foliage has several features that make it easy to identify.  Each leaf is 2 to 8 inches long, serrated, oppositely arranged on lower foliage, but sometimes alternately arranged on the upper part of the stem.  Leaves are sessile or with very short petioles.

(Epilobium ciliatum) foliage

Northern willowherb (Epilobium ciliatum) foliage

Notice the distinctly sunken veins on the leaves.

(Epilobium ciliatum) foliage

Northern willowherb foliage is oppositely arranged along the stem, though sometimes upper foliage can be alternately arranged.

(Epilobium ciliatum) foliage

On the preceding three images, notice the red coloration in the foliage.

Also note that depending on growing conditions, plant foliage (and plant size) can be much smaller.

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