Quick answer: 5 native Oklahoma plants have a recorded bloom range that includes December.
5 species
- Apache plume Fallugia paradoxa · 8 states
- Buffalograss Bouteloua dactyloides · 19 states
- Little bluestem Schizachyrium scoparium · 42 states
- Prairie blazing star Liatris pycnostachya · 19 states
- Witch-hazel Hamamelis virginiana · 33 states