The Desiderative san gets the augment iṭ after the roots 1. smiṅ 2. pūṅ 3. ṛ 4. añjū and 5. aśū,
Thus सिस्मयिषते, पिपविषते 7.4.80 अरिरिषति, अञ्जिजिषति 6.1.2 and 6.1.3 and अशिशिषते ॥ The root पूञ् is not governed by this rule, as पुपूषति ॥ The अश् (V. 18). of Suadi class is taken here, and not अश् (IX. 51) of Kryadi class, for the latter always has इट्, while the former having an indicatory long ऊ has optionally इट् ॥,