catenata or Veronica anagallis-aquatica
Water Speedwell grows in muddy
or swampy places on the plains or foothills. Stem leaves are opposite and clasp
the stem. Flowers have four blue petals and two stamens. Flowers are in
racemes that arise from the axils of the leaves. A similar species is Veronica
americana (not pictured), whose leaves all have short petioles.