Dianella is a monocot genus of flowering plants.
 They are commonly called flax lilies.
Hemerocallidoideae is the botanical name of a subfamily of flowering plants, part of the family Asphodelaceae "sensu lato" in the monocot order Asparagales according to the APG system of 2016.
 Earlier classification systems treated the group as a separate family, the Hemerocallidaceae.
 The name is derived from the generic name of the type genus, "Hemerocallis".
 The largest genera in the group are "Dianella" (with 20 species), "Hemerocallis" (15), and "Caesia" (11).
Arctotis is a genus of annual and perennial plants in the family Asteraceae.

Question: Arctotis and Dianella, are a type of what?
Answer: plants