Quick answer: 46 native Texas plants have a recorded bloom range that includes September.
46 species
- Antelope-horns milkweed Asclepias asperula · 2 states
- Autumn sage Salvia greggii · 2 states
- 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
- Carolina jessamine Gelsemium sempervirens · 9 states
- Common buttonbush Cephalanthus occidentalis · 23 states
- Common yarrow Achillea millefolium · 31 states
- Creosote bush Larrea tridentata · 5 states
- Desert marigold Baileya multiradiata · 4 states
- Desert willow Chilopsis linearis · 4 states
- Devil's walking stick Aralia spinosa · 14 states
- Dotted blazing star Liatris punctata · 10 states
- Eastern purple coneflower Echinacea purpurea · 22 states
- Green milkweed Asclepias viridis · 1 states
- Honey mesquite Prosopis glandulosa · 3 states
- Indiangrass Sorghastrum nutans · 19 states
- Inland sea oats Chasmanthium latifolium · 3 states
- Little bluestem Schizachyrium scoparium · 23 states
- Loblolly bay Gordonia lasianthus · 5 states
- Longleaf pine Pinus palustris · 6 states
- Maximilian sunflower Helianthus maximiliani · 3 states
- Maypop passionflower Passiflora incarnata · 13 states
- Mealy blue sage Salvia farinacea · 1 states
- Mexican hat Ratibida columnifera · 17 states
- Mexican olive Cordia boissieri · 1 states
- Partridge pea Chamaecrista fasciculata · 13 states
- Pink-scale blazing star Liatris elegans · 5 states
- Prairie blazing star Liatris pycnostachya · 16 states
- Rocky Mountain bee plant Peritoma serrulata · 22 states
- Scarlet rosemallow Hibiscus coccineus · 5 states
- Scarlet sage Salvia coccinea · 3 states
- Sideoats grama Bouteloua curtipendula · 25 states
- Spotted beebalm Monarda punctata · 14 states
- Swamp sunflower Helianthus angustifolius · 15 states
- Switchgrass Panicum virgatum · 24 states
- Trumpet vine Campsis radicans · 24 states
- Virginia saltmarsh mallow Kosteletzkya pentacarpos · 4 states
- White heath aster Symphyotrichum ericoides var. ericoides · 10 states
- Witch-hazel Hamamelis virginiana · 28 states
- Yellow bells (esperanza) Tecoma stans · 3 states
- Yellow necklacepod Sophora tomentosa · 1 states
- Yellow passionflower Passiflora lutea · 2 states