Of the iris family (Iridaceae), the blue flag or Iris versicolor.
F. Schuyler Mathews Field Book of American Wild Flowers (New York, NY: G. P. Putnam's Sons, 1902)
TIFF (full resolution)
852×2400, 857.1 KiB
Large GIF
363×1024, 110.3 KiB
Medium GIF
227×640, 48.0 KiB
Small GIF
113×320, 13.7 KiB