Digitalis

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  D. purpurea

  1a. Lobes of the calyx broad-lanceolate to obovate, mostly 6–9 mm wide; corolla purple, pale pink, or white
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  1b. Lobes of the calyx linear to lanceolate, mostly 1–2.5 mm wide; corolla yellow to white
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    D. grandiflora

    2a. Corolla 40–50 mm long; leaf blades sparsely pubescent on the abaxial suface; stem pubescent
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    2b. Corolla (9–) 15–30 mm long; leaf blades usually glabrous on the abaxial surface; stem usually glabrous
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      D. lanata

      3a. Corolla 20–30 mm long, the connate portion cupuliform, the middle lobe of lower lip much surpassing the lateral lobes and 8–13 mm long; sepals glandular-villous (i.e., glandular hairs found on the surfaces of the sepals)
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      D. lutea

      3b. Corolla (9–) 15–22 (–25) mm long, the connate portion cylindrical to cylindrical-urceolate, the middle lobe of lower lip slightly exceeding the lateral lobes and 
5–6 mm long; sepals glandular-ciliate (i.e., glandular hairs found only on the margins 
of the sepals)

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 Show photos of:   Each photo represents one species in this genus.