Creeping wood sorrel has small yellow flowers. One variety has purple leaves, and is sometimes used as a ground cover.
More often, it is a very persistent weed in lawns and gardens.
This is a stolon, a stem that grows horizontally on or under
the surface of the soil. See how it put out roots at the nodes.
It also produces upward shoots from some nodes. When the
stolon is broken, or part of it dies, the shoots become independent
plants (clones of the plant the stolon started from). This is a form of
Here is the fruit of the wood sorrel. When mature, at a touch, each of these pods will explode. they can shoot sticky seeds a considerable distance.
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