The tropical rain or monsoon forests grow under 1200 m alt. In southeastern Tibet, where lianas and usneas hang across mutually and between trees; in the forests grow the flower plants such as Dendrobium densiflorum (yellow), D. nobile (white), Thunbergia coccinea (red), Clerodendrum tibetanum (red), Musa sanguinea (reddish orange) and Tacca integrifolia with special form of flower.