Calamariphyllum elegans

Sol's delight is a plant unique to Pandora that is magnetotropic, meaning it is able to detect and orient itself towards a magnetic field. Its large plant body is thick but flexible due to the presence of mucilaginous fibers in the stem, which are specialized cells with unevenly thick cell walls that allow uneven growth of an organ. To the “delight” of the humans on Pandora, sol's delight responds to the magnetism of unobtanium deposits and grows towards their general direction. This trait has been exploited by miners to help in their excavation activities. (Read more)
Sol's delight was also found to contain a latex substance with great potential for industrial use. Plants were collected and returned to earth for agricultural testing, but they did not produce the same quality latex in Earth’s atmosphere.