Which Myrtales family includes pomegranate and water chestnut?

Both the pomegranate and the water chestnut (genus Trapa) are included in the family Lythraceae within the order Myrtales.1

While older botanical classifications sometimes placed these plants in their own separate families—Punicaceae for the pomegranate and Trapaceae for the water chestnut—modern classification systems now include them within Lythraceae.123

It is important to note that the name "water chestnut" is also commonly applied to Eleocharis dulcis, which is a member of the sedge family (Cyperaceae) and is not part of the order Myrtales.4