茨菰

arrowhead (Sagittaria subulata, a water plant)

Caltrop or puncture vine (Tribulus terrestris) / to thatch (a roof)

Manchurian wild rice (Zizania latifolia), now rare in the wild, formerly harvested for its grain, now mainly cultivated for its edible stem known as 茭白筍|茭白笋[jiao1 bai2 sun3], which is swollen by a smut fungus / (variant of 菇[gu1]) mushroom