This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
藋 combines the grass radical 艹 with 翟, which likely contributes sound. The exact historical development is uncertain.
The grass top 艹 over 翟 suggests a plant name, but the specific meaning is unclear. Picture an unknown leafy plant with a tall, feathery plume like the 羽 in 翟.
For チョウ, imagine a long-feathered plant named Chou: Chou -> チョウ, and the feathery 翟 part helps you remember the sound.