Clianthus, commonly known as kakabeak ("Kōwhai ngutukākā" in Māori), is a genus of flowering plants in the legume family Fabaceae, comprising two species of shrubs native to New Zealand.
 They have striking clusters of red flowers which resemble the beak of the kākā, a New Zealand parrot.
 The plants are also known as parrot's beak, parrot's bill and lobster claw - all references to the distinctive flowers.
 There is also a variety with white to creamy coloured flowers.
Ceratonia is small genus of flowering trees in the pea family, Fabaceae, endemic to the Mediterranean region and the Middle East.
 Its best known member, the carob tree, is cultivated for its pods and has been widely introduced to regions with similar climates.
 The genus was long considered monotypic, but a second species, "Ceratonia oreothauma", was identified in 1979 from Oman and Somalia.
 It belongs to the subfamily Caesalpinioideae, tribe Caesalpinieae.
Prosopis alba is a South American tree species that grows in central Argentina, the Gran Chaco ecoregion, and part of the Argentine Mesopotamia, as well as Bolivia, Paraguay, and Peru.
 It is known as algarrobo blanco in Spanish, which means "white carob tree".
 Spanish settlers gave it that name because of its similarity to the European carob tree ("Ceratonia siliqua").
 Other common names come from Guaraní, including ibopé and igopé.
Clianthus puniceus, common name kaka beak ("Kōwhai Ngutu-kākā" in Māori), is a species of flowering plant in the genus "Clianthus" of the legume family Fabaceae, native to New Zealand's North Island.
 It is an evergreen shrub, one of two species of "Clianthus", both of which have striking clusters of red flowers resembling the beak of the kākā, a New Zealand parrot.
 The plant is also known as parrot's beak, parrot's bill and lobster claw.
 There is also a variety with white to creamy coloured flowers.

Question: what does Clianthus and Ceratonia have in common?
Answer: flowering