Quick answer: 5 native Alaska plants have a recorded bloom range that includes September.
5 species
- Bunchberry Cornus canadensis · 7 states
- Fireweed Chamerion angustifolium · 28 states
- Harebell Campanula rotundifolia · 25 states
- Pearly everlasting Anaphalis margaritacea · 18 states
- Shrubby cinquefoil Dasiphora fruticosa ssp. floribunda · 15 states