Yellow Woodsorrel (Oxalis stricta):  A native perennial belonging to the family oxalidaceae.  In the Lafayette, IN. area yellow woodsorrel can sometimes act like an annual do to weather related stresses.  The plant is supported by a shallow tap root.  The slender, branching stem is sparsely hairy.  The leaves are divided into three heart-shaped leaflets.  Due to the oxalic acid content the leaves have a bitter or sour taste.   Flowers are made up of five conspicuous bright yellow petals.Cucumber shaped seed pods, 1/2 to 1 inch long and having 5 sides, are formed as the flower matures.  When dry the seed pods have a triggering mechanism that expels the seeds in all directions from the slightest touch.  Plants reproduce from seed.  Usually occurs on moist fertile sites.

 

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