In The Dark: Like some other plants, I. pallida can tell with its roots whether a neighboring plant is its sibling.
In The Light: With unrelated neighbors, I. pallida grows short, leafy stalks. With sibling neighbors, it grows taller stalks with fewer leaves, thus sharing the sunlight, says a study from McMaster University in Ontario.
Under Scrutiny: Other plant species have been shown to take up fewer nutrients through their roots when siblings are growing nearby, but this is the first time a plant has been shown to conspire with kin above ground.
Learn more about Impatiens pallida at the Encyclopedia of Life.