Smile when you call me a duckweed

Wolffia, a type of duckweed, is the smallest flowering plant. They float on the top of ponds, as the name suggests. Each has a single pistil and stamen, and each produces a the world’s smallest fruit, the size of a grain of salt, called a “utricle.” Here’s an electron micrograph image of a single flowering Wolffia, labelled so you can see where all the naughty parts are.



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