Pertya scandens (a species of aster)
A deciduous shrub in the Asteraceae family, native to Japan. The name literally means 'Kōya broom', as its branches were traditionally used to make brooms.
Pertya scandens blooms with white flowers in autumn.
I found a Pertya scandens along the mountain path.
Katakana spelling; sometimes used for plant names in scientific or field-guide contexts.
The name こうやぼうき (高野箒) literally means 'Kōya broom', referring to Mount Kōya (高野山) and the traditional use of its branches for making brooms. The exact historical derivation is uncertain.