The Magical Golden Flower is a beautiful, glowing, lily-like flower featured in the film Tangled. Though it does not and cannot speak, it appears genuinely benevolent as it willingly heals all injuries, possibly the reason it fell to Earth in the first place, and when restoring Flynn Rider to life, it spread golden symbols and trails through the air to cause his return.
A single drop of sunlight fell from the heavens, and from this single drop of sun grew the golden flower. It had the ability to heal any sickness or injuries, even mortal wounds, as demonstrated by Rapunzel, delay aging, as demonstrated by Gothel, though that ability requires constant use of the power.
One day, Mother Gothel discovered the flower, and chose to hoard its healing power for herself. She used it to keep herself young for hundreds of years, and all she had to do was sing a special song. It appears that when the song is sung, the flower releases pollen which is breathed in. Even though Mother Gothel had hidden the flower, other people knew of its existence, suggesting that this flower was not the first of its kind.
As the centuries passed, across a lake from where the flower grew, a kingdom soon came into being. The kingdom was ruled by a benevolent King and Queen. The queen was about to have a baby, but fell seriously ill. Knowing that she and her unborn child would surely die if a cure was not found soon, the entire kingdom went searching for the flower.
When Gothel left the flower in plain sight by accident, one of the kingdom's soldiers found the flower, and it was uprooted and brought back to the castle, where it was made into an infusion for the queen. Soon afterwards the queen recovered, and gave birth to a healthy baby girl: Princess Rapunzel. She was born with the rest of the flower's ability, which was the majority of it. A bit obviously went into the queen. Rapunzel gave a drop to Eugene to heal his stab wound that he received from Gothel, but still has most of the flower within. Perhaps as a thanks to the flower for saving the queen and Rapunzel, at the cost of its own existence, Corona adopted the sun as its symbol.
In the years after, the spot where the flower grows became a sacred and forbidden site, with a small pedestal in its place and large, indestructible thorn-like rocks surrounding it. Like the flower before them, these rocks have magical properties, as demonstrated when Rapunzel touches one of them and resulted in her previously long, magical golden locks to regrow, and in this case inheriting the rocks' indestructibility. In the episode, "The Quest for Varian" according to an old scroll the rocks appeared to be formed from drops of moonlight. More importantly, the rocks and the flower are connected together, but for what purpose remains unknown for now.
In Moana, the flower briefly appears near the epilogue, when the camera zooms into Tui and Sina inspecting the island's recovering flora.
In the original fairy tale, a rampion plant was ingested by Rapunzel's mother before Rapunzel was born, not a flower. Also, while the rampion had no mystical properties nor ties to Rapunzel's birth, Rapunzel was named after it for the rampion had come from a witch Rapunzel's father stole from.
Mother Gothel about to use the flower
The Flower is found by a soldier
The Flower about be to used to heal the Queen
The ill Queen drinks the flower drink to make her feel better