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Digitalis
See list of 4 species in this genus-
1a. Lobes of the calyx broad-lanceolate to obovate, mostly 6–9 mm wide; corolla purple, pale pink, or white; leaf blades coarsely serrate
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1b. Lobes of the calyx linear to lanceolate, mostly 1–2.5 mm wide; corolla yellow to white; ; leaf blades variable, ranging from entire to serrate
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2a. Corolla 40–50 mm long; leaf blades sparsely pubescent on the abaxial suface; stem pubescent; leaf blades finely and evenly serrate
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2b. Corolla (9–) 15–30 mm long; leaf blades usually glabrous on the abaxial surface; stem usually glabrous; ; leaf blades variable, ranging from entire to serrate
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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); leaf blades entire or nearly so
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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); leaf blades serrate
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Each photo represents one species in this genus.