What tree does the beautiful southern tree refer to?

It refers to the lush leaves and vibrant scenes of banyan trees.

This topic is the reading comprehension of Ba Jin's prose Bird's Paradise. Part of the original text is as follows:

Now is the season of lush foliage (the trees have produced small fruits, and many of them have fallen off. This banyan tree seems to show us all its vitality. There are so many green leaves, one on top of the other, leaving no gaps. Green is shining before our eyes, as if every leaf has a new life trembling, this beautiful southern tree!

From above, we can see that green is shining before our eyes, as if there is a new life trembling on every leaf. It is written that the big banyan tree is very green, and the author feels that there is a surge of vitality from the green, praising the vigorous vitality. This sentence uses a figurative rhetorical device to praise the life of the banyan tree.

Extended data:

Bird's Paradise is an essay written by modern writer Ba Jin in 1933. This article tells that the author and his friends are reluctant to part with countless birds in "Bird Paradise". In this article, the author explored and described the beauty of natural scenery with fresh and fluent pen, entrusted his own good feelings and created a beautiful and distant artistic conception.

At the same time, the author did not describe this "paradise of birds" in isolation, but highlighted this "paradise of birds" under the contact and contrast of sunset, green hills, tower shadows, waves, fields and dynasties in the early summer water towns in the south of the Yangtze River. Although the language of the full text is simple and plain, it shows the beauty of poetry and painting everywhere, and has a peaceful, quiet and energetic pastoral artistic conception.

Baidu encyclopedia-bird's paradise