Capellan flower

From Memory Alpha, the free Star Trek reference.

A Capellan flower is a flowering plant native to the planet Capella IV that has a lifespan of only a few hours.

Sarah April had a Capellan flower while she was on board the USS Enterprise as it traveled to the planet Babel in 2270.

When the Enterprise was accidentally pulled into the Beta Niobe supernova and into an antimatter universe, it was discovered that the flower was reversing in age to the point that it reverted to the seed from which it had germinated from.

After the ship and crew returned to their "positive matter universe" the flower was given a second chance to began its life anew. (TAS: "The Counter-Clock Incident")