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Key to Scrophulariaceae

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1 Plant a shrub; inflorescence a terminal thyrse
1 Plant an herb; inflorescence either a raceme, a spike, or a diffuse panicle (Scrophularia and Verbascum), or the flowers solitary from basal axils (Limosella).
  2 Plants aquatic, < 6 cm tall; flowers solitary on pedicels from basal axils
  2 Plants terrestrial, > 60 cm tall; inflorescence a raceme, a spike, or a diffuse panicle.
    3 Corolla cylindric, purplish; fertile stamens 4
    3 Corolla rotate, yellowish; fertile stamens 5
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