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Key to Thymus

Lamiaceae

Thymus

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1 Leaves eciliate, revolute
1 Leaves ciliate (at least basally), not (or only slightly) revolute.
  2 Leaves without marginal veins; stem hairs confined only to 4 angles of stem
  2 Leaves with marginal veins present (at least in upper portion of leaves); stem hairs confined mostly to 2 sides only