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Updated: May 13, 2025
Evening's mildest radiance seemed to linger on a scene so fair, and there was a mellow haze in the distance that softened every object. The cattle and horses were up to their flanks in grass and young reeds, and plants indicative of a better soil, such as the sowthistle, the mallow, peppermint, and indigofera were growing in profusion around us.
Rhododendron arboreum becomes plentiful at 5000 to 6000 feet, forming a large tree on dry clayey slopes; it is accompanied by Indigofera, Andromeda, Spiraea, shrubby Compositae, and very many plants absent at similar elevations on the wet outer Dorjiling ranges.
The plant known as "Indigofera Tinctoria" is sown in March in soil carefully prepared, grows to about 5 feet, is cut down early in July, is fermented in vats, and the liquor is beaten till it precipitates the precious blue dye, which is boiled, drained, cut in small cakes, and dried. From first to last the growth and the manufacture are even more precarious than most tropical crops.
The manufacturers of Cumanacoa, of San Fernando, and of Arenas, produce indigo of greater commercial value than that of Caracas; and often nearly equalling in splendour and richness of colour the indigo of Guatimala. It was from that province that the coasts of Cumana received the first seeds of the Indigofera anil,* which is cultivated jointly with the Indigofera tinctoria.
The culminant rocks are very dry, but in the rains may possess many curious plants; a fine Kalanchoe was common, with the berberry, a beautiful Indigofera, and various other shrubs; a Bolbophyllum grew on the rocks, with a small Begonia, and some ferns. There were no birds, and very few insects, a beautiful small Pontia being the only butterfly.
But a colouring matter, chemically identical, may be extracted from plants belonging to neighbouring genera; and I should not at present venture to affirm that the native indigoferae of America do not furnish some generic difference from the Indigofera anil, and the Indigofera argentea of the Old World. In the coffee-trees of both hemispheres this difference has been observed.
You see this is quite a different process of pigment colouring from that of rubbing or working a colour mechanically on to the fibre. Natural Substantive Colours. Indigo, one of the most valuable dyes, is the product of a large number of plants, the most important being different species of indigofera, which belong to the pea family.
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