Ginger is an example of underground modified stem called
Rhizome
Corm
Tuber
Bulb
The lateral branches originate from the basal and underground portion of the main stem, grow horizontally beneath the soil and then come out obliquely upward giving rise to leafy shoots.
Stolon is
Underground stems of potato, ginger; turmeric, Zaminkand, Colocasia are the examples of modified stem for
In sweet pea, the tendrils are modified
Underground stem is rhizome in plant