| ignea | orange red | vuurrood, oranjerood | Cuphea ignea |
| ilicifolius | with leaf of Ilex | met blad van de ilex | Osmanthus ilicifolius |
| im-, in-, | without, on, to | zonder, op, naar | Rhododendron impeditum |
| imperialis | emperorlike | keizerlijk | Frittelaria imperialis |
| incana | grey | grijs | Alnus incana |
| incisa | incised | ingesneden | Stephanandra incisa |
| indica | Indonesian | Indisch | Azalea indica |
| indivisa | undivided | onverdeeld | Codyline indivisa |
| infundibuliformis | funnel shaped | trechtervormig | Crossandra infundibuliformis |
| innocenti | after Innocent | naar innocent | Nidularium innocntii |
| inodora | without smell | reukloos | Lonas inodora |
| insigne | obvious visible | opvallend kenbaar | Paphiopedulum inigne |
| intermedia | standing in between | tussen in staand | Hamamelis intermedia |
| inversa | reversed | omgekeerd | Picea abies 'Inversa' |
| involucrata | protected | omhuld | Davidia involucrata |
| ionantha | daisy-flower, violet | vioolbloemig | Saintpaulia ionantha |
| isophylla | with even leaves | gelijkbladig | Campanula isophylla |
| italica | Italian | Italiaans | Anchusa italica |
