| Singular | Plural | |
|---|---|---|
| Nominativ | planities, planicies | planities, planicies |
| Genitiv | planitiei, planitie | planitierum |
| Dativ | planitiei, planitii, planitie | planitiebus |
| Akkusativ | planitiem, planitiemque, planiciem | planities, planicies |
| Ablativ | planitie | planitiebus |
| Vokativ | planities, planicies | planities, planicies |