noun
prickly sow-thistle; spiny sow thistle
A common weed with spiny leaves and yellow flowers, often found in disturbed areas. The name literally means 'demon's field mustard'.
道端にオニノゲシがたくさん生えている。
A lot of prickly sow-thistles are growing by the roadside.
オニノゲシの葉には鋭いトゲがある。
The leaves of the prickly sow-thistle have sharp spines.
ノゲシ (Sonchus oleraceus) is a similar but less spiny sow-thistle species; オニノゲシ is distinguished by its prickly leaves.
Compound of 鬼 (oni, 'demon') + の (no, possessive particle) + 芥子 (keshi, 'poppy' or 'mustard'), literally 'demon's field mustard'. The name likely refers to the plant's fierce, spiny appearance.