Question: Aponogeton and Wikstroemia, both are which type of mutual species?

Context paragraphs:
Wikstroemia: Wikstroemia is a genus of 55-70 species of flowering shrubs and small trees in the mezereon family, Thymelaeaceae.  Hawaiian species are known by the common name false ohelo.

Aponogeton: The Aponogetonaceae (Cape-pondweed family or Aponogeton family) are a family of flowering plants in the order Alismatales.  The Aponogetonaceae is considered to be allied to the Potamogetonaceae - Najadaceae complex of families.

Supporting paragraphs: Aponogeton Wikstroemia
Answer: flowering