Hey Haertig! Yes, the publisher wanted the book to be useful to anyone in North America, not just my adopted home of Texas. Luckily, many of the tree and weeds are found everywhere, including Hawaii.

For more info on Hawaii's special flora your daughter should check out the Hawaiian forager Sunny Savage. She rocks!
https://ediblehi.com/foraging-hawaii-sunny-savage/
http://sunnysavage.com
If your daughter does score a class with Sunny, send the message "Merriwether says Hi!"
-Blast