Castanea pumila var. Status Ozark chinquapin is in decline due to chestnut blight, a fungal disease which kills trees before they mature. Stump sprouts grow from larger trees that were killed by chestnut blight. Ozark chinquapin flowers from late May to June. Nuts mature from June to September.
Leaves turn yellow in the autumn.
In Oklahoma, populations are scattered in Choctaw, Delaware, Mayes, Adair, Cherokee, Leflore, Latimer, and McCurtain counties. Chinquapin oak also occurs on sandy, basic soils. Allegheny chinquapin grows in sandy soil and is most common on the Oklahoma Coastal Plain. It is rare in the Ozark Plateau. The main threat to Ozark chinquapin is chestnut blight, a disease caused by the fungus Endothia parasitica .