There isn't a single name for bushes growing under large trees in forests. The specific types of bushes will vary depending on the climate, soil conditions, and the dominant trees in the forest.

Here are some terms that describe the situation, though:

* Understory: This is the general term for the layer of vegetation growing beneath the canopy of a forest, including shrubs, small trees, ferns, and herbs.

* Shrub layer: This refers specifically to the layer of bushes within the understory.

* Undergrowth: A more general term that can include any kind of vegetation growing on the forest floor, including bushes, vines, and grasses.

To be more specific, you could consider the following:

* The type of forest: For example, "the understory of a temperate deciduous forest" or "the shrub layer of a tropical rainforest."

* The dominant tree species: "The bushes growing beneath the oak trees" or "the undergrowth in a pine forest."

* The specific types of bushes: "Mountain laurel bushes" or "rhododendrons."

If you can provide more context about the forest you're interested in, I can give you a more specific answer.