This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 藼 is uncertain. It visually combines the grass radical 艹 with 憲, but the original semantic and phonetic roles are unclear.
With the grass radical 艹 on top and 憲 below, you might imagine a plant used in legal or official contexts, but the true meaning is obscure.
For ケン, picture a ken (a Japanese prefecture) where this mysterious grass grows: ken -> ケン, and the grass 艹 covers the land.