baby's breath, name for a plant of the family Caryophyllaceae (pink family) and for several other flowers, e.g., white bedstraw of the family Rubiaceae (madder family) and grape hyacinth of the family Liliaceae (lily family). The pink and madder families are classified in the division Magnoliophyta, class Magnoliopsida, orders Caryophyllales and Rubiales, respectively. The lily family is classified in the class Liliopsida, order Liliales.
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