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Key to Aloysia

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1 Leaf blades 4-21 mm wide, ca. 1.2-1.7× as long as wide; leaf margins with 6-12+ regular teeth on each margin; leaf upper surface strongly rugose; corollas violet, lavender, pink , or reddish
1 Leaf blades 2-8 mm wide, ca. 2-4× as long as wide; leaf margins entire or with 1-4 sharp and divergent teeth on each margin; leaf upper surface plane; corollas white or very light violet.
  2 Leaf blades narrowly oblong or elliptic, entire; lower leaf surface appressed-puberulent
  2 Leaf blades broadly elliptic, obovate, or oblong-elliptic, the larger leaves usually 2-8-toothed; lower leaf surface densely strigillose and shortly hispidulous on the veins