Tulip, Alstroemeria, Bomarea, Dioscorea hispida, Gagea, and Fritillaria.
It is not a violet. Dogtooth Violet refers to the shape of the white bulb of the plant. The names adder's-tongue and trout, fawn, snow, and glacier lily are also used interchangeably for the American species.
Guin JD, Franks H. Fingertip dermatitis in a retail florist. Cutis 2001 Apr;67(4):328-30.
Mitchell JC, Rook A, 1979, Botanical Dermatology, Plants and Plant products injurious to the skin, Greengrass, Vancouver.
Diamond KB, Warren GR, Cardellina JH 2nd. Native American food and medicinal plants. 3. alpha-Methylene butyrolactone from Erythronium grandiflorum Pursh. J Ethnopharmacol 1985 Sep;14(1):99-101.