Rasendracudamani 10.81

10.81

mudrikeyaṃ vidhātavyā dṛṣṭapratyayakārikā /
himālayottare pārśve aśvakarṇo mahādrumaḥ //

this ring is to be made, producing verified results. / 'On the northern slope of the Himālaya is the great Aśvakarṇa tree;