The annual vegetation which springs up in the rainy season includes numerous genera, such as Sida and Indigofera, which are largely represented both in Africa and Hindustan.
On the drier and higher mountains of the interior of the chain, the forests become more open, and are spread less uniformly over the hill-sides, a luxuriant herbaceous vegetation appears, and the number of shrubby Leguminosae, such as Desmodium and Indigofera, increases, as well as Ranunculaceae, Rosaceae, Umbelliferae, Labiatae, Gramineae, Cyperaceae and other European genera.
The shrubby vegetation comprises Rosa, Rubus, Indigofera, Desmodium, Berberis, Boehmeria, Viburnum,' Clematis, with an Arundinaria.
Fritzsche showed that by treating indigo with caustic potash it yielded an oil, which he named aniline, from the specific name of one of the indigo-yielding plants, Indigofera anil, anil being derived from the Sanskrit nila, dark-blue, and nila, the indigo plant.
Indigofera - Elegant shrubs of medium or dwarf stature, so far as known with us, natives of China and Japan.