Title: London.
Question: What is the name of the national rugby union stadium located in South-West London?

Title: Houston.
Question: Downtown Houston consisted of what type of building in the 1960's?

Title: Ottoman Empire.
Question: Turkish and Greek cuisine are descended from Ottoman Cuisine, along with the food of what other regions?

Title: Flowering plant.
Question:
What system did Arthur Cronquist put forth in 1968, but not publish in full form until 1981?