Amaranthaceae
Ox knee
Achyranthes bidentata
- Family
- Amaranthaceae
- Genus
- Achyranthes
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Common names
By language (10)
- arz
- اكيرانثيس بينداتا
- Chinese
- 牛膝, 牛膝茎叶, 淮牛膝, 牛膝（怀牛膝）, 怀牛膝, 红柳叶牛膝, 小叶牛膝, 少毛牛膝
- English
- Ox knee, Japanese chaff flower
- Finnish
- Kiinantähkähäntä, Tähkähäntä
- Japanese
- イノコヅチ, イノコズチ, ヒカゲイノコズチ, ヒカゲイノコヅチ
- Korean
- 쇠무릎
- lzh
- 牛膝
- Malayalam
- പെരുംകടലാടി
- Thai
- ห่วยหงู่ฉิก
- Vietnamese
- Ngưu tất
Synonyms
- Achyranthes aspera var. fruticosa (Lam.) Boerl.
- Achyranthes bidentata f. rubra F.C.Ho
- Achyranthes bidentata var. bidentata Blume
- Achyranthes bidentata var. hachijoensis (Honda) H.Hara
- Achyranthes bidentata var. japonica Miq.
- Achyranthes bidentata var. longifolia Makino
- Achyranthes bidentata var. tomentosa (Honda) H.Hara
- Achyranthes bidentata var. villosa J.L.Liu
- Achyranthes chinensis Osbeck
- Achyranthes fauriei H.Lév. & Vaniot
- Achyranthes fauriei f. rotundifolia Ohwi
- Achyranthes fauriei var. tomentosa Honda
- Achyranthes fruticosa Lam.
- Achyranthes hispida Moq.
- Achyranthes japonica (Miq.) Nakai
- Achyranthes japonica var. hachijoensis Honda
- Achyranthes japonica var. katsuudakemontana Tawada
- Achyranthes javanica Moq.
- Achyranthes lanceolata Klein bis ex Wall.
- Achyranthes longifolia (Makino) Makino
- Achyranthes longifolia f. rubra F.C.Ho
- Achyranthes megaphylla Y.H.Li
- Achyranthes mollicula Nakai
- Achyranthes ogatai Yamam.
- Achyranthes rotundifolia (Ohwi) M.Suzuki
- Achyranthes ryukyuensis Tawada
- Achyranthes wightiana Wall.
- Centrostachys bidentata (Blume) Standl.
- Centrostachys fruticosa (Lam.) Standl.
- Centrostachys moquinii Standl.
Characteristics
- In the US and Canada
- Pacific Basin: introduced
Photos
Photo: Stanislav Doronenko, CC BY 2.5, from Wikimedia Commons Photo: danno1800, CC BY-SA 4.0, from Pl@ntNet via GBIF 
Photo: Stanislav Doronenko, CC BY-SA 2.5, from Wikimedia Commons Photo: danno1800, CC BY-SA 4.0, from Pl@ntNet via GBIF 
Photo: IloveU4ever, CC BY-SA 3.0, from Wikimedia Commons Photo: princethakur, CC BY-SA 4.0, from Pl@ntNet via GBIF 
Photo: IloveU4ever, CC BY-SA 3.0, from Wikimedia Commons Photo: Yushin Hozumi, CC BY-SA 4.0, from Pl@ntNet via GBIF 
Photo: IloveU4ever, CC BY-SA 3.0, from Wikimedia Commons Photo: danno1800, CC BY-SA 4.0, from Pl@ntNet via GBIF 
Photo: Dinesh Valke from Thane, India, CC BY-SA 2.0, from Wikimedia Commons Photo: danno1800, CC BY-SA 4.0, from Pl@ntNet via GBIF
More in Achyranthes
- Devil's horsewhipAchyranthes asperaAmaranthaceae
- Blunt chaff flowerAchyranthes muticaAmaranthaceae
- Round chaff flowerAchyranthes splendensAmaranthaceae
- Chaff treeAchyranthes arborescensAmaranthaceae
- Achyranthes talbotiiAmaranthaceae
- Achyranthes mangarevicaAmaranthaceae
- Psilotrichum densiflorumAchyranthes leptostachyaAmaranthaceae
- Achyranthes margaretarumAmaranthaceae
- Achyranthes fasciculataAmaranthaceae
- Achyranthes fruticulosaAmaranthaceae
- Achyranthes graminiformisAmaranthaceae
- Achyranthes lanicepsAmaranthaceae
Sources: classification, synonyms from World Flora Online Plant List (2026-06, CC0 1.0); common names, popularity from Wikidata (2026-10-26, CC0 1.0); US characteristics from USDA PLANTS Database (2025-05-29, CC0 1.0). About our plant data.