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Veratrum
See list of 2 species in this genus-
1a. Tepals abruptly narrowed to an obvious claw, with 2 basal nectary glands; leaf blades narrow-oblanceolate, 1–7.2 cm wide; filaments introrse
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1b. Tepals gradually narrowed to an obscure claw, with a single V-shaped nectary gland on the basal margins; leaf blades ovate to elliptic, 8–20 cm wide; filaments extrorse
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Each photo represents one species in this genus.