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: "To which taxonomic category do both Polygonum and Sapium belong?" whose answer is genus.
Each document should contain about 30 words, and these documents should contain useful information.

Query: taxonomic classification of Polygonum and Sapium
Useful Output:

Doc 1: Anatomy and Histochemistry of Leaves and Stems of Sapium  Anatomical and Histochemical Characters of Polygonum  Taxonomy of Polygonoideae (Polygonaceae): A
Doc 2: [11] A Profile of Polygonum glabrum [12] Polygonum glabrum, commonly known as "wild buckwheat" or "smoothstem knotweed," belongs to the Polygonaceae family.
Doc 3: From Wikipedia, the free encyclopedia Hydrocotyle bonariensis Largeleaf Pennywort Scientific classification Kingdom: Plantae Division: Magnoliophyta Class
Doc 4: A classification of spatial simulation models of fire and vegetation dynamics (landscape fire succession models or LFSMs) is presented.
Doc 5: The present study was designed to explore the α-amylase inhibitory, antioxidant, and antimicrobial activities of Polygonum hydropiper L. Polarity-based solvent