Āpasthūṇa (Apasthuna)is one of the ṛṣivaṁśas (rishivamsas; hereditary or disciple-wise cults of the sages), belonging to the gotra (clan) of Maharṣi (Maharsi; great sage) Vaśiṣṭha(Vasishtha)). According to the genealogical or disciple-wise line from Aṇgirā, they are also known as Vāśiṣṭhī (Vasishthi).