茭白

Manchurian wild rice 菰[gu1], aka water bamboo, or its edible stem, which resembles a bamboo shoot

Zizania aquatica

white / snowy / pure / bright / empty / blank / plain / clear / to make clear / in vain / gratuitous / free of charge / reactionary / anti-communist / funeral / to stare coldly / to write wrong character / to state / to explain / vernacular / spoken lines in opera

edible stem of Manchurian wild rice 菰[gu1], aka water bamboo