rhizome
Rhizome (rhizome) is a kind of mutant stalk. The branches of some plants, but not on the ground above the growth, but in the soil growth, from the morphological point of view, like the roots of plants. But the root of the role is to absorb the water and minerals in the soil, while the rhizome is not, it is only the expansion of the plant volume. A similar phenomenon also has a tub. ...