Summary description from Wikipedia:

Persicaria barbata in languages:

Chinese

毛蓼

English

Hairy knotweed or Smartweed

Japanese

ケタデ

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Parent Taxon

• Persicaria

Sibling Taxa

• Persicaria acuminata
• Persicaria amphibia
• Persicaria angustifolia
• Persicaria arifolia
• Persicaria assamica
• Persicaria attenuata
• Persicaria barbata
• Persicaria biconvexa
• Persicaria bicornis
• Persicaria borneensis
• Persicaria breviochreata
• Persicaria bungeana
• Persicaria caespitosa
• Persicaria capitata
• Persicaria careyi
• Persicaria cespitosa
• Persicaria cespitosum
• Persicaria chinensis
• Persicaria criopolitana
• Persicaria debilis
• Persicaria decipiens
• Persicaria dichotoma
• Persicaria dissitiflora
• Persicaria elatior
• Persicaria erecto-minor
• Persicaria erectominor
• Persicaria extremiorientalis
• Persicaria ferruginea
• Persicaria filiformis
• Persicaria foliosa
• Persicaria galapagensis
• Persicaria glabra
• Persicaria glacialis
• Persicaria hastatosagittata
• Persicaria hirsuta
• Persicaria hispida
• Persicaria humilis
• Persicaria hydropiper
• Persicaria hydropiperoides
• Persicaria hystricula
• Persicaria japonica
• Persicaria jucunda
• Persicaria kawagoeana
• Persicaria lanigera
• Persicaria lapathifolia
• Persicaria limbata
• Persicaria limicola
• Persicaria longiseta
• Persicaria maackiana
• Persicaria maculosa
• Persicaria madagascariensis
• Persicaria meisneriana
• Persicaria microcephala
• Persicaria minor
• Persicaria mitis
• Persicaria muricata
• Persicaria nakaii
• Persicaria neofiliformis
• Persicaria nepalensis
• Persicaria obtusifolia
• Persicaria odorata
• Persicaria orientalis
• Persicaria paradoxa
• Persicaria pensylvanica
• Persicaria perfoliata
• Persicaria pilosa
• Persicaria pilushanensis
• Persicaria pinetora
• Persicaria pinetorum
• Persicaria poiretii
• Persicaria posumbu
• Persicaria praetermissa
• Persicaria prostrata
• Persicaria pubescens
• Persicaria pulchra
• Persicaria punctata
• Persicaria puritanorum
• Persicaria robustior
• Persicaria rotunda
• Persicaria runcinata
• Persicaria sagittata
• Persicaria segetum
• Persicaria senegalensis
• Persicaria senticosa
• Persicaria setacea
• Persicaria setosula
• Persicaria sinica
• Persicaria sinuata
• Persicaria stelligera
• Persicaria strigosa
• Persicaria subsessilis
• Persicaria sylvestris
• Persicaria taitoinsularis
• Persicaria taquetii
• Persicaria thunbergii
• Persicaria tinctoria
• Persicaria tomentosa
• Persicaria trigonocarpa
• Persicaria virginiana
• Persicaria viscofera
• Persicaria viscosa
• Persicaria wellensii
• Persicaria wugongshanensis

Top Observation Places

• Tai Po