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Hoya kerrii, or Hoya Hearts, are tropical succulent vines that are often cultivated and sold as leaf cuttings. They belong to the Dogbane family, Apocynaceae, which includes some notable plants such as Dogbane, Oleander, Plumeria, Periwinkle, Golden Trumpet, and Mandevilla. Plants in Apocynaceae have latex sap, are usually fragrant, and are high in alkaloids (esp. Iridoids). The aromatic compounds produced by the flowers are prized as fragrances in perfumes, and the flowers are also cultivated as ornamentals in warmer climates. Hoya flowers are fragrant and waxy-looking, with the fragrance changing with the age of the flower.
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