Ausonius plays on passion ungoverned.

Nymphis quae Hylam merserunt furtim:

Naides amore saevo et irrito:

ephebus iste flos erit.

To the nymphs who secretly drowned Hylas, 

 the Naiads’ with savage and unfulfilled love, 

 that young man will be a flower.

Nymphis: to the nymphs

Quae: who

Hylam: accusative of Hylas

Merserunt: they drowned, plunged

Furtim: secretly, stealthily

Naides: the Naiads

Amore: with love

Saevo et irrito: savage and unfulfilled (ablative)

Ephebus: young man (from the Greek)

Iste: that

Flos erit: will be a flower