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Key to Scrophulariaceae

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1 Leaves alternate and primarily cauline, the surfaces with conspicuous punctate glands and internal oil-secreting cavities; [s. FL and s. TX only in our flora area]
1 Leaves opposite or if alternate then also with well-developed basal leaves (Verbascum); [collectively widespread, but with the exception of Buddleja, excluding s. TX and s. FL].
  2 Plant a shrub; inflorescence a terminal thyrse
  2 Plant an herb; inflorescence either a raceme, a spike, or a diffuse panicle (Scrophularia and Verbascum), or the flowers solitary from basal axils (Limosella).
    3 Plants aquatic, < 6 cm tall; flowers solitary on pedicels from basal axils
    3 Plants terrestrial, > 60 cm tall; inflorescence a raceme, a spike, or a diffuse panicle.
      4 Cauline leaves opposite; corolla cylindric, purplish; fertile stamens 4
      4 Cauline leaves alternate; corolla rotate, yellowish; fertile stamens 5