出典:Wiktionary
From the genus name (Latin caltha).
Borrowed from Ancient Greek κάλαθος (kálathos), καλθε (kalthe, “yellow flower”), later “goblet” (because of its shape), from Proto-Indo-European *ǵʰelh₃- (“gleam, yellow”).
First declension.
| Case | Singular | Plural |
|---|---|---|
| Nominative | caltha | calthae |
| Genitive | calthae | calthārum |
| Dative | calthae | calthīs |
| Accusative | caltham | calthās |
| Ablative | calthā | calthīs |
| Vocative | caltha | calthae |
出典:Wikipedia