perdicium

βορβόρῳ δ' ὕδωρ λαμπρὸν μιαίνων οὔποθ' εὑρήσεις ποτόν → once limpid waters are stained with mud, you'll never find a drink

Latin > English (Lewis & Short)

perdīcĭum: ĭi, n., = περδίκιον.
I Pellitory: helxinen vocant, Plin. 22, 17, 19, § 41.—
II The plant parthenium, Plin. 21, 30, 104, § 176.