Using a place gives incorrect search results

I’m trying to confirm the distribution of a group of trilliums in western North America using a place called Western United States and Canada. As far as I can tell, that place (65360) includes two Canadian provinces (6834,7085) and eleven U.S. states (40,14,34,22,16,50,9,10,52,46,15), so the following pair of queries should produce similar (if not identical) results:

All observations of Trillium subgenus Callipetalon in Western United States and Canada

All observations of Trillium subgenus Callipetalon in Alberta, British Columbia,Arizona, California, Colorado, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, Wyoming,7085,40,14,34,22,16,50,9,10,52,46,15&subview=map&taxon_id=1413207&view=species

The previous two queries return 32,402 and 32,602 results, respectively. I’m wondering why the query using the place returns significantly fewer results? TIA

The boundary of “Western US and Canada” is rough and excludes a couple chunks of the states and Canada.

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A small but observation-dense slice of California is excluded in particular.

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Thanks for looking. I’ll probably not use this place.