a kind of quince
梠 refers to a specific type of quince, a fruit-bearing tree. The meaning is narrow and botanical, without broader abstract extensions.
梠 combines 木 (tree) with 吕, which likely serves as a phonetic component. The character is used for a type of quince tree, but the exact historical development is uncertain.
The tree radical 木 on the left suggests a plant, and the right side 吕 looks like two stacked fruits. Picture a quince tree with paired fruits hanging like the two 口 shapes.
For ロ, imagine a row of quince trees: row -> ロ, and each tree in the row bears the fruit.