Quick answer: 36 native Arkansas plants have a recorded bloom range that includes September.
36 species
- Big bluestem Andropogon gerardii · 25 states
- Black-eyed Susan Rudbeckia hirta · 42 states
- Blue mistflower Conoclinium coelestinum · 26 states
- Buffalograss Bouteloua dactyloides · 9 states
- Butterflyweed Asclepias tuberosa · 37 states
- Cardinal flower Lobelia cardinalis · 37 states
- Common buttonbush Cephalanthus occidentalis · 23 states
- Common yarrow Achillea millefolium · 31 states
- Compass plant Silphium laciniatum · 11 states
- Crimson-eyed rose-mallow Hibiscus moscheutos · 14 states
- Devil's walking stick Aralia spinosa · 14 states
- Dotted blazing star Liatris punctata · 10 states
- Eastern purple coneflower Echinacea purpurea · 22 states
- Fall obedient plant Physostegia virginiana · 21 states
- Grayhead coneflower Ratibida pinnata · 12 states
- Great blue lobelia Lobelia siphilitica · 32 states
- Hollow Joe-pye weed Eutrochium fistulosum · 14 states
- Leavenworth's eryngo Eryngium leavenworthii · 1 states
- Maximilian sunflower Helianthus maximiliani · 3 states
- Maypop passionflower Passiflora incarnata · 13 states
- Mexican hat Ratibida columnifera · 17 states
- Ozark witch-hazel Hamamelis vernalis · 1 states
- Prairie blazing star Liatris pycnostachya · 16 states
- Prairie rosinweed (prairie dock) Silphium terebinthinaceum · 4 states
- Purple prairie clover Dalea purpurea · 5 states
- Roundhead lespedeza Lespedeza capitata · 7 states
- Royal catchfly Silene regia · 1 states
- Scaly blazing star Liatris squarrosa · 5 states
- Sideoats grama Bouteloua curtipendula · 25 states
- Spotted beebalm Monarda punctata · 14 states
- Swamp sunflower Helianthus angustifolius · 15 states
- Tall blazing star Liatris aspera · 11 states
- Trumpet vine Campsis radicans · 24 states
- White prairie clover Dalea candida · 1 states
- Wholeleaf rosinweed Silphium integrifolium · 5 states
- Witch-hazel Hamamelis virginiana · 28 states