A Grammatical Dictionary of Botanical Latin

indigena,-ae (Latin adjective) meaning ‘native, indigenous’ is an example of an adjective with first declension endings for all three genders. Please note carefully that the neuter singular and plural is the same as the nominative; and also that the nominative neuter plural is ‘indigena’ not ‘indigenae:’

indigena,-ae (Latin adjective) > indu- [‘inside’ + -gena, ‘born,’ “from a strengthened form of ‘in-‘ (into) + variant of gigno (I beget)” (Wikipedia “indigena” Feb 2023), also Lewis & Short):

                  singular                        plural   
Nom.  (m./f.) indigena  (n.) indigena   (m./f.) indigenae (n.) indigena
Gen.             indigenae                     indigenarum
Dat.             indigenae                      indigenis
Acc.  (m./f.) indigenam (n.) indigena   (m.f.) indigenas  (n.) indigena
Abl.             indigena                       indigenis

- vinum indigena, a native or indigenous wine, abl.sg. vino indigena, nom. pl. vina indigena.

- miles indigena, a native soldier, gen.sg. militis indigenae, abl.sg. milite indigena, nom. p. milites indigenae.

- Latini indigenae, native Latins, Latinorum indigenarum.