polygonum
/pəˈlɪɡ(ə)nəm
/noun
A plant of a genus that includes knotgrass and knotweed, some of which are weeds and some are garden ornamentals.
- Genus Polygonum, family Polygonaceae.
- ‘I love how it grows into the polygonum,’ Julie says.
- The Scotts Valley polygonum, a small annual in the buckwheat family, has linear-shaped leaves and produces white flowers.
Origin
Modern Latin, from Greek polu- 'many' + gonu 'knee, joint' (because of the swollen joints sheathed by stipules).