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Oklahoma State Grass:

Indian grass - Sorghastrum nutans. Wichita Mountains National
Wildlife Refuge, Comanche County, Oklahoma - photo © amy_b on Flickr - use permitted with attribution / no derivative works.
See All State Flowers - National Flower.
Indian Grass
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Oklahoma designated Indiangrass (Sorghastrum nutans) as the official state grass in 1972.
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Source:
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