Heterostyly in Eichhornia

Eichhornia crassipes is another plant exhibiting heterostyly (genetically determined differences in length of the flower’s pistil and stamens between individuals), but there are supposedly three morphs in the species (tristylous).  I’ve only encountered the two shown below, but they are frequently found nearby one another (within a few meters). 

Heterostyle in Eichhornia crassipes - 07.04.2010 - 07.55.21 Heterostyle in Eichhornia crassipes - 07.04.2010 - 07.55.56

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