The Allen and Greenough is still under construction;
so some links may not work quite the way you would expect.
Summary of i-Stems.
73. The i-declension was confused even to the Romans
themselves, nor was it stable at all periods of the language, early Latin
having i-forms which afterwards
disappeared. There was a tendency in nouns to lose the i-forms, in adjectives to gain them. The
nominative plural (-ís)[An
old, though not the original, ending (see p. 32, footnote 2).] was most
thoroughly lost, next the accusative singular (-im), next the ablative (-í); while the genitive and accusative
plural (-ium, -ís) were
retained in almost all.