pine tree, fir tree
枩 centers on coniferous evergreen trees: specifically pine and fir. The meanings are closely related types of trees.
枩 is a variant form of 松 (pine). It combines 木 (tree) with 公, which likely contributes the sound. The stacked arrangement is an alternate layout of the same components.
A tree 木 with a public 公 shape beneath it: imagine a pine tree standing in a public park, its branches spreading wide.
For ショウ, picture the pine tree casting a long shadow (ショウ) on the public ground below: shadow -> ショウ, and the tree is a pine.