The lotus leaf refers to the leaf of the hydrophyte called lotus, which floats on the water's surface, and is also called Kayo due to the introduction of Chinese herbal drugs.
蓮の葉（はすのは）とは蓮という水生植物の水面に浮いている葉のことをさし漢方薬の伝来により荷葉（かよう）ともいう。