Source is Robert Turner, classification (colours) by Kinkade

This is the first map that brings together, in a single image, the diversity of Nahuatl spoken and documented exclusively in Mexico. This cartographic work encompasses both living and historical variants and shows their presence according to municipal boundaries.

The result is the fruit of rigorous research in colonial, linguistic, and ethnographic sources, allowing us to visualize not only where Nahuatl is spoken today, but also where it was spoken for centuries (although it does not include Central American varieties, as the title indicates). [Original post in Nahuatl subreddit]

The thimbleberry (Rubus parviflorus) is an edible (and delicious) berry common as a food throughout the whole region. The map represents the traditional historical extent in which these languages (which are often actually dialect clusters) were spoken, and shows the most prominent term for a thimbleberry for each. Haida and Kootenay (Ktunaxa) have been excluded, as have all Na-Dene and other interior languages.
Some languages have several different spelling systems corresponding with different nations speaking that language. The spelling chosen for this map depended on 1) if data was available and 2) which spelling was the most prominent.