Rough cocklebur
Xanthium occidentale Bertoloni [Asteraceae]
O˙onamomi (オオオナモミ, 大葈耳)
Lifeform: annual forb
Distribution: origin in the north America (exotic to Japan)
Habitat: open fields in urbanized regions
Seed dispersal: external animal
Poisonous plant
Xanthium occidentale in Hokkaido
X. occidentale is native and the others are exotic.
X. italicum Moretti (イガオナモミ)
X. occidentale Bertoloni (オオオナモミ)
X. spinosum L. (トゲオナモミ)
X. strumarium L. (オナモミ)
Xanthium occidentale in Hokkaido
[Left] A shoot. [Center] close-up of fruits. [Rgiht] close-up of leaf. At N25/W3, North Ward, Sapporo, on August 30 2010.
References
- Field training on integrated environmental research 統合環境調査法実習
fauna and flora 出現種リスト