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The highest ridge is naked of trees, but to the north the slope is in one portion covered with heavy tree-jungle, in which the underwood is as thick as I have ever seen it: it consists of an Acanthaceous plant; the forest itself of oaks, chesnuts and Rhododendron arboreum, which last is common on the highest margin. 

The outer flowers in several Acanthaceous genera are large and conspicuous but sterile; the next in order are smaller, open, moderately fertile and capable of cross-fertilisation; whilst the central ones are cleistogamic, being still smaller, closed and highly fertile; so that here the inflorescence consists of three kinds of flowers.