Staminal tube is found in

Staminal tube is found in Hibiscus. In Hibiscus - a flower's male stamens are composed of the pollen-producing anther atop a stem like filament. Yellow anthers open and are discharge yellow pollen. Each anther is held aloft by a slender, pink filament,each filament is then attached to a pale, pink cylinder, known as a staminal column or stamen tube.
Therefore, the correct answer is option C.