duckweed
薸 centers on duckweed, a tiny floating aquatic plant. The meaning is specific and concrete, referring to this plant itself.
薸 is a phono-semantic compound: 艹 (grass) indicates a plant, and 漂 (ヒョウ) gives the sound and also suggests floating, fitting duckweed's nature.
The grass radical 艹 sits above 漂 (drift), like tiny green plants drifting on water: duckweed.
For ヒョウ, imagine a hyō (ヒョウ, leopard) floating on a mat of duckweed: the leopard's spots blend with the tiny leaves, and hyō -> ヒョウ.