You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "Which genus has more species, Buddleja or Koelreuteria?" whose answer is Buddleja.
Each document should contain about 30 words, and these documents should contain useful information.

Query: number of species in Buddleja
Useful Output:

Doc 1: The Buddleja genus originated in central China and migrated across Asia and to the Americas, evolving into over 140 species as it spread. B.
Doc 2: Buddleja davidii Franch. (Scrophulariaceae) is a “magnet” for various butterfly species (e.g., Aglais io (L.), Melanargia galathea (L.), Danaus
Doc 3: We are a specialist nursery growing over 60 varieties of Buddleja, Buddleja's are extremely useful shrubs for the garden, they offer wonderful flowers
Doc 4: It is a naturalised invasive alien species in Europe, Australasia and North America. Although naturalised in many US states it is not considered
Doc 5: A member of the figwort family (along with foxgloves, toadflaxes and speedwells), there are 140 species of buddleia worldwide. Three are found