sassafras tzumu
檫 refers to a specific tree, Sassafras tzumu, a type of sassafras. Its meaning is a single botanical species rather than a broad concept.
檫 is a phono-semantic compound: 木 (tree) provides the meaning, and 察 likely contributes the sound サツ. The character was created specifically for the sassafras tree.
A tree 木 named after the sound 察 (サツ): picture a sassafras tree with a label reading '察' to remind you it's Sassafras tzumu.
For サツ, imagine a sassafras tree being inspected (察) by a botanist: the inspection sound サツ (from 察) helps you remember the tree's reading.