Common Name: woodsorrel, yellow (Oxalis)
Species: Oxalis stricta L.
Bayer Code: OXAST

Yellow woodsorrel is an herbaceous perennial common in greenhouse and turf situations. It is most recognizable due to the heart-shaped leaflets that are found three to a leaf. The plant has a shallow taproot, and hairy stems that are 4 to 10 inches tall. Flowers are bright yellow, have five petals, and bloom in early spring (March to April). The fruit is a narrow capsule ½ to 1 inch long. The supporting stalk bends just below the capsule.
yellow woodsorrel (oxalis)
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yellow woodsorrel (oxalis)
yellow woodsorrel (oxalis)
yellow woodsorrel (oxalis) leaf arrangement
yellow woodsorrel (oxalis) leaf arrangement
Growth Season perennial weed 
Growth Habit uprightupright, but very low-growing plant
Leaflet Number three 
Leaf Margin smooth 
Leaf Hairs none 
Leaf/Leaflet Shape heart/kidney/spadepartly folded
Leaf Width 1/2 - 1 inch 
Leaf Venation pinnate 
Leaf Arrangement alternate 
Root Type fibrousnote the extensive rhizomes associated with this plant
Flower Color yellow