| Rike | Planteriket (Plantae) |
| Uekte gruppe | | Karplanter (Tracheophytes) |
| Overrekke | | | Frøplanter (Spermatophyte) |
| Rekke | | | | Dekkfrøete blomsterplanter (Magnoliophyta) |
| Underklasse | | | | | Tofrøblader (Magnoliidae) |
| Familie | | | | | | Erteblomstfamilien (Fabaceae) |
| Slekt | | | | | | | Erteknappslekta (Lathyrus) |
| Art | | | | | | | | Bleikflatbelg (Lathyrus ochrus) |
| Art | | | | | | | | Blomsterert (Lathyrus odoratus) |
| Art | | | | | | | | Breiflatbelg (Lathyrus latifolius) |
| Art | | | | | | | | Bueflatbelg (Lathyrus incurvus) |
| Art | | | | | | | | Fôrflatbelg (Lathyrus sativus) |
| Art | | | | | | | | Gulflatbelg (Lathyrus pratensis) |
| Art | | | | | | | | Jordflatbelg (Lathyrus tuberosus) |
| Art | | | | | | | | Knollerteknapp (Lathyrus linifolius) |
| Art | | | | | | | | Lasarusflatbelg (Lathyrus pisiformis) |
| Art | | | | | | | | Lodneflatbelg (Lathyrus hirsutus) |
| Art | | | | | | | | Myrflatbelg (Lathyrus palustris) |
| Underart | | | | | | | | | Snau myrflatbelg (Lathyrus palustris subsp. palustris) |
| Underart | | | | | | | | | Håret myrflatbelg (Lathyrus palustris subsp. pilosus) |
| Art | | | | | | | | Mølleflatbelg (Lathyrus aphaca) |
| Art | | | | | | | | Purpurflatbelg (Lathyrus cicera) |
| Art | | | | | | | | Skogflatbelg (Lathyrus sylvestris) |
| Art | | | | | | | | Småflatbelg (Lathyrus annuus) |
| Art | | | | | | | | Strandflatbelg (Lathyrus japonicus) |
| Underart | | | | | | | | | Nordlig strandflatbelg (Lathyrus japonicus subsp. japonicus) |
| Underart | | | | | | | | | Sørlig strandflatbelg (Lathyrus japonicus subsp. maritimus) |
| Art | | | | | | | | Svarterteknapp (Lathyrus niger) |
| Art | | | | | | | | Sveltflatbelg (Lathyrus inconspicuus) |
| Art | | | | | | | | Vårerteknapp (Lathyrus vernus) |