common groundsel (Senecio vulgaris)
A common annual weed in the daisy family, native to Europe but widely naturalized in Japan. Often found in fields and roadsides.
A lot of common groundsel is growing by the roadside.
Kanji spelling is rare and complex; the plant name is almost always written in kana.
Hiragana spelling is also used, though katakana is more common for plant names.
The name ノボロギク is composed of 野 (no, 'field'), 襤褸 (boro, 'rags' or 'tattered'), and 菊 (kiku, 'chrysanthemum'), referring to the plant's ragged-looking leaves and its weedy nature. The exact origin of the name is uncertain.