A non green stem branch that grows obliquely or sometimes grows horizontally inside the soil and then comes out of the soil as a branch is called
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Solution
sucker
The sucker originates as a non green lateral branch from the underground axillary bud of an aerial shoot.
It grows underground obliquely or horizontally for some distance before emerging upwards as a branch. Suckers bear axillary buds at the nodes, which can give rise to new plants, e.g, Chrysanthemum.