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: "Exacum and Biarum, are which type of items?" whose answer is plants.
Each document should contain about 30 words, and these documents should contain useful information.

Query: Exacum and Biarum plant
Useful Output:

Doc 1: PLANT STRUCTURE, HORTICULTURAL CHEMISTRY, &C.; AND J.  Biarum, Schott. Bidens, Linnzeus. Biebersteinia  Exacum, Linnzus. Exochorda, Lindley. Exostemma
Doc 2: Habitat: It is a higher elevation plant (1700–2700 m alt.) found in grasslands. Distribution: This is rare and endemic to southern Western
Doc 3: The Horticulture Plant List is a list of plants that may be imported from all countries other than the continental United States with the following standard
Doc 4:  Biarum  Waterbirds disperse a wide range of plant seeds via their guts, promoting biotic connectivity between isolated habitat patches.
Doc 5: Exacum, Gentianothamnus, Ornichia, Klackenbergia  N. E. Br. Biarum auraniticum Mouterde · Biarum bovei Blume · Biarum olivieri Blume.