Awn refers to hairy or bristle-like growths on a plant, especially grains. See https://en.wikipedia.org/wiki/Awn_(botany) for more details.
Mnemonic
[m-] Mario is [2] inside the [-ang] chapel where he is sitting next to 亡 Death on one of the pews. Death force feeds him a magical 艹 flower of death which makes Mario die, and from his body grows a bunch of thin-like hairs known as 芒 awn. Like the hair or bristles at the head of wheat, the multi-colored 芒 awn grow out of Mario's dead corpse, and effect from the flower. Strange.