English edit

 
A heartseed or balloon vine (Cardiospermum halicacabum) opened to show the seeds
 
 
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Etymology edit

heart +‎ seed

Noun edit

heartseed (countable and uncountable, plural heartseeds)

  1. Any plant of the genus Cardiospermum, climbing plants with round seeds marked with a spot like a heart.
    Synonyms: love in a puff, balloon vine
    • 1866, John Lindley, Thomas Moore, The Treasury of Botany: A Popular Dictionary of the Vegetable Kingdom[1], page 222:
      The common Heartseed (C. Halicacabum), sometimes called also Winter cherry, or Heart-pea, is a widely distributed plant, found in all tropical countries.

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