Species
Between 65 and 300 species are recognised, depending on the circumscription of the genus; some botanists divide the genus into several smaller genera, including Fagopyrum, Fallopia and Persicaria.
The genus Polygonella has a number of morphological similarities with Polygonum, and some authors have included Polygonella in Polygonum.
Selected species include:
- Polygonum achoreum
- Polygonum acetosum
- Polygonum acuminata
- Polygonum acuminatum - tapertip smartweed
- Polygonum albanicum
- Polygonum alpestre
- Polygonum arenarium
- Polygonum arenastrum – small-leaved knotgrass
- Polygonum argyrocoleon
- Polygonum arifolium
- Polygonum aviculare – common knotgrass
- Polygonum bellardii
- Polygonum bidwelliae
- Polygonum bistortoides American bistort, western bistort, smokeweed or mountain meadow knotweed
- Polygonum bolanderi
- Polygonum boreale
- Polygonum brasiliensis
- Polygonum bungeanum - Bunge's smartweed
- Polygonum buxiforme
- Polygonum caespitosum
- Polygonum californicum – California knotweed
- Polygonum careyi - Carey's smartweed
- Polygonum cascadense
- Polygonum caurianum
- Polygonum chinense
- Polygonum coccineum
- Polygonum cognatum – Madimak or Indian knotgrass
- Polygonum davisiae
- Polygonum densiflorum
- Polygonum dibotrys
- Polygonum douglasii – Douglas' knotweed
- Polygonum erectum
- Polygonum flaccidum – (Meisn.)
- Polygonum foliosum
- Polygonum forrestii
- Polygonum fowleri
- Polygonum franktonii
- Polygonum glaucum
- Polygonum griffithii
- Polygonum herniarioides
- Polygonum heterosepalum – dwarf desert knotweed
- Polygonum hickmanii
- Polygonum hirsutum
- Polygonum hongkongensis
- Polygonum hudsonianum
- Polygonum hydropiperoides - swamp smartweed
- Polygonum lacerum
- Polygonum lanigerum
- Polygonum marinense
- Polygonum maritimum – sea knotgrass
- Polygonum meisneranum
- Polygonum meisnerianum
- Polygonum minimum – broadleaf knotweed
- Polygonum multiflorum
- Polygonum newberryi - Newberry knotweed
- Polygonum oxyspermum – Ray's knotgrass
- Polygonum paronychia
- Polygonum paronychioides
- Polygonum parryi
- Polygonum patulum - Bellard's smartweed
- Polygonum perfoliatum – mile-a-minute weed
- Polygonum phytolaccifolium
- Polygonum plebeium
- Polygonum polycnemoides
- Polygonum polycnenoides
- Polygonum polygaloides
- Polygonum polystachyum
- Polygonum punctatum - dotted smartweed
- Polygonum raii = Polygonum oxyspermum
- Polygonum ramosissimum
- Polygonum robustius - stout smartweed
- Polygonum rurivagum
- Polygonum salicifolium
- Polygonum scoparium
- Polygonum segetum - field smartweed
- Polygonum setaceum - bog smartweed
- Polygonum shastense
- Polygonum striatulum
- Polygonum tenue
Read more about this topic: Polygonum
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