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Key to Digitalis

Plantaginaceae

Digitalis

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1 Corolla 13-18 mm long, pale yellow to white; plant nearly glabrous
1 Corolla 20-55 mm long, white, yellow, or purple; plant conspicuously pubescent on the stem and/or leaves.
  2 Corolla 20-30 mm long, white to pale yellow, the lower median lobe much longer than the others
  2 Corolla 40-55 mm long, purple or white, the lower median lobe only slightly longer than the others