 In the case of Rubiaceous tuberous antplants such as "Myrmecodia" plants, which rank highest in number and diversity among the antplants, all have very large, tuberous, modified stems containing many chambers.This adaptation is to house colonies of arboreal ants, which live within the readymade chambers naturally grown by the plant.The tuber begins its growth with the swelling of the seedling hypocotyl.