2 Metaphors for undergrowths

Under the Mombins the undergrowth is, for the most part, huge fans of Cocorite palm, thirty or forty feet high, their short rugged trunks, as usual, loaded with creepers, orchids, birds'-nests, and huge round black lumps, which are the nests of ants; all lodged among the butts of old leaves and the spathes of old flowers.

Looking in that direction, Lance imagined that the shadow was less dark, and although the undergrowth was denser, he struck off carelessly toward it.

2 Metaphors for  undergrowths