Deteris
From Simon Online
Deteris dixit Dyascorides quod est gladiolus, capitulo de gladiolo.
Translation:
Deteris is the Latin gladiolus, Dyascorides said in his chapter De gladiolo {"On the gladiole"}.
Commentary:
Deteris is simply a lapsus calami which shows up in one codex for Dexeris. Dexeris q.v. itself is De xeris.