Alstroemeria: A plant genus of the family LILIACEAE. Members contain allergens, tuliposide A and tulipalin A.Liliaceae: A monocot family within the order Liliales. This family is divided by some botanists into other families such as Convallariaceae, Hyacinthaceae and Amaryllidaceae. Amaryllidaceae, which have inferior ovaries, includes CRINUM; GALANTHUS; LYCORIS; and NARCISSUS and are known for AMARYLLIDACEAE ALKALOIDS.Arctium: A plant genus of the family ASTERACEAE. Arctiin (LIGNANS) is in the seed.Tulipa: A plant genus of the family LILIACEAE. Members contain tuliposides and tulipalins and have been associated with allergic contact dermatitis in florists.Intramolecular Lyases: Enzymes of the isomerase class that catalyze reactions in which a group can be regarded as eliminated from one part of a molecule, leaving a double bond, while remaining covalently attached to the molecule. (From Enzyme Nomenclature, 1992) EC 5.5.Alkenes: Unsaturated hydrocarbons of the type Cn-H2n, indicated by the suffix -ene. (Grant & Hackh's Chemical Dictionary, 5th ed, p408)Flowers: The reproductive organs of plants.