To which taxonomic category do both Polygonum and Sapium belong?
Polygonum Polygonum is a genus of about 220 species of flowering plant in the buckwheat and knotweed family Polygonaceae. Common names include knotweed, knotgrass, bistort, tearthumb, mile-a-minute, smartweed and several others. In the Middle English glossary of herbs "Alphita" ( 1400-1425), it was known as ars-smerte. There have been various opinions about how broadly the genus should be defined. For example, Buckwheat ("Fagopyrum esculentum") has sometimes been included in the genus as "Polygonum fagopyrum".
Boraginoideae Boraginoideae is a subfamily of the flowering plant family Boraginaceae, as that family is defined in the APG III system of classification for flowering plants. The Angiosperm Phylogeny Group has not actually specified subfamilies within Boraginaceae. Some taxonomists place the genera "Codon" and "Wellstedia" in Boraginoideae. Others place one or both of these in separate, monogeneric subfamilies. "Codon" was long regarded as an odd member of Hydrophylloideae, but in 1998, a molecular phylogenetic study showed that it is closer to Boraginoideae.