Anandakanda 1.15.134

1.15.134

varṣādvalijarāmuktaḥ sa jīved brahmaṇo dinam /
<śunakaśālmalīpuṣpakalpaḥ>
tasyāṣṭādaśa puṣpāṇi gokṣīre 'ṣṭapale pacet //

After a year, freed from wrinkles and senescence, he lives for a day of Brahmā.
<Regimen of Śunakaśālmalī Flower>
One should cook eighteen of its flowers in eight palas of cow's milk.