grape hyacinth, any plant of the genus Muscari of the family Liliaceae (lily family), low plants with dense spikelike clusters of small, nodding flowers that are usually deep blue. Of more than 50 Old World species several have been successfully cultivated and naturalized in the United States and are especially popular as rock-garden plants. Grape hyacinths are classified in the division Magnoliophyta, class Liliopsida, order Liliales, family Liliaceae.
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