The Mimosa.
The Khair, or Mimosa (Acacia catechu) seems to owe most of the estimation in which it is held to its use in producing the sacred fire. It forms, on account of its hardness, the base of the Aranî or sacred fire-drill, and in it the wedge of the softer Pîpal wood works and fire is produced by friction. The Yûpa or sacrificial post to which the victim was tied for the sacrifice was often made of this wood. In the great horse sacrifice of the Râmâyana, twenty-one of these posts were erected, six made of Vilva (Agle marmelos), six of Khadira or Acacia, six of Palâsa (Butea frondosa), one of Udumbara (Ficus glomerata), Sleshmataka (Cordia myxa), and one of Devadru, the Deodâr pine tree.
Of the Khair tree Bishop Heber thus writes in his Journal:53 “As I returned home I passed a fine tree of the Mimosa, with leaves at a little distance so much resembling those of the mountain ash, that I was for a moment deceived, and asked if it did not bear fruit. He answered, ‘No; but it was a very noble tree, being called the “Imperial tree,” for its excellent qualities.’ That it slept all night, and was alive all day, withdrawing its leaves if any one attempted to touch them. Above all, however, it was useful as a preservative against magic; a sprig worn in the turban, or suspended over the bed, was a perfect security against all spells, Evil Eye, etc., insomuch that the most formidable wizard would not, if he could help it, approach its shade. One indeed, they said, who was very renowned for his power (like Lorrinite of Kehama) of killing plants and drying up their sap with a look, had come to this very tree and gazed upon it intently; ‘but,’ said the old man, who told me this with an air of triumph, ‘look as he might, he could do the tree no harm,’ a fact of which I made no question. I was amused and surprised to find the superstition, which in England and Scotland attaches to the rowan tree, here applied to a tree of nearly similar form.”
This superstition regarding the rowan tree and the elder is familiar in European folk-lore. In Ireland the roots of the elder and those of an apple tree which bears red apples, boiled together and drunk fasting, expel evil spirits. In connection with this idea that the mimosa sleeps at night, pious Hindus prefer not to eat betel leaves after sunset, as catechu forms part of the ingredients with which they are prepared.