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A hollow sac-like or tubular extension of some part of a flower.


Don E. Eyles, A Guide and Key to the Aquatic Plants of the Southeastern United States (Wahington D.C.:U.S. Government Printing Office, 1944) 13


TIFF (full resolution)

1573×2400, 355.6 KiB

Large GIF

671×1024, 37.8 KiB

Medium GIF

419×640, 24.5 KiB

Small GIF

209×320, 9.7 KiB