Texas Toadflax (Nuttallanthus texanus)
Texas Toadflax is a North American native annual that can be found from British Columbia to Mexico, east to the Atlantic coast. It is fairly common in the prairies, open woods & grassy pinelands. It's most distinctive feature is a large basal spur.
Sources and links:
USDA Distribution Map
Lady Bird Johnson Wildflower Center
Missouri Flora
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