iNat doesn’t have a range map for P. breweriana, that page is displaying the Checklist places. A range map would display in pink and have a separate legend listing, like the second screenshot here.
Range maps are imported from external sources, often IUCN, and aren’t available for most plants. Checklist places originate within iNat and can be based on observations or can be manually changed. If a Checklist place has been set to Introduced, the outline of that place is dashed lines instead of solid.
Anyone can edit the Establishment Means.