Psychotria elata, a neotropical plant in the family Rubiaceae, has become internet-famous because of its flowers—or rather the shape of the red bracts (modified leaves) before the flowers mature. As The Amusing Planet notes:
These gorgeous pair of red, luscious lips belong to a plant known as Psychotria elata, a tropical tree found in the rain forests of Central and South American countries like Colombia, Costa Rica, Panama and Ecuador. Affectionately, Psychotria elata is called Hooker’s Lips or the Hot Lips Plants. The plant has apparently evolved into its current shape to attract pollinators including hummingbirds and butterflies. According to Oddity Central, the bracts are only kissable for a short while, before they spread open to reveal the plant’s flowers.
Without having seen it, I am still 100% sure that Central and South American kids pick these bracts and run around with them in their mouths.
In the end, though, I think a less salacious and more appropriate name would be “Marilyn Monroe lips”