Plants

Botany

Algae (128)

Not really a botanical grouping, but shrug.

Angiospermae (6289)

According to the APG II system: Angiospermae.
English: flowering plants, angiosperms.
German: Bedecktsamer.
Swedish

Bryophyta (26)

Bryophyta.
English: mosses.
German: Moose.
Finnish: Sammalet.
Swedish: moss

Eudicotyledon (22724)

English: core eudicots.
Swedish: rottrikolpater, roteudicoter.
French: noyaux des dicotylédones vraies
Dependency: Angi

Fungi (300)

Botanically, it's not fungi -> families, but this lumps the fungi nicely under just three hierarchy levels (family - genus - species).

Gymnospermae (890)

Gymnospermae.
English: gymnosperms.
German: Nacktsamige Pflanzen, Nacktsamer.
Finnish: paljassiemenise

Lycopodiophyta (59)

Lycopodiophyta D.H.Scott.
German: Bärlapppflanzen.
Finnish: liekomaiset.
French: lycophytes.

Pteridophyta (285)

Pteridophyta Schimp.
English: ferns.
German: Gefäßsporenpflanzen.
Finnish: sanikkaiset.