Quick answer: 23 native Arizona plants have a recorded bloom range that includes September.
23 species
- Antelope-horns milkweed Asclepias asperula · 2 states
- Apache plume Fallugia paradoxa · 6 states
- Blue grama Bouteloua gracilis · 15 states
- Buffalograss Bouteloua dactyloides · 9 states
- Butterflyweed Asclepias tuberosa · 37 states
- California buckwheat Eriogonum fasciculatum · 2 states
- Candy barrel cactus (fishhook barrel) Ferocactus wislizeni · 1 states
- Cardinal flower Lobelia cardinalis · 37 states
- Creosote bush Larrea tridentata · 5 states
- Cutleaf coneflower Rudbeckia laciniata · 21 states
- Desert globemallow Sphaeralcea ambigua · 2 states
- Desert marigold Baileya multiradiata · 4 states
- Desert willow Chilopsis linearis · 4 states
- Fireweed Chamerion angustifolium · 28 states
- Harebell Campanula rotundifolia · 25 states
- Jojoba Simmondsia chinensis · 2 states
- Little bluestem Schizachyrium scoparium · 23 states
- Purple prairie clover Dalea purpurea · 5 states
- Rocky Mountain bee plant Peritoma serrulata · 22 states
- Scarlet gilia Ipomopsis aggregata · 9 states
- Shrubby cinquefoil Dasiphora fruticosa ssp. floribunda · 15 states
- Sideoats grama Bouteloua curtipendula · 25 states
- Yellow bells (esperanza) Tecoma stans · 3 states