"产树胶之树" can be translated into English as "gum-producing trees" or "trees that yield gum".
Both expressions are commonly used to describe trees that naturally produce gum or resin. Here are examples in sentences:
Gum-producing trees play an important role in the ecosystem. （产树胶之树在生态系统中扮演着重要角色。）
These regions are known for their abundant gum-producing trees. （这些地区以其丰富的产树胶之树而闻名。）