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Family: Oxalidaceae (Wood-sorrel family)
Mid-Atlantic bloom time: March - June
Slender Yellow Wood-sorrel is an upright perennial with few or no hairs on its stems. Its yellow flowers form at or slightly above its 3-part leaves. Its petals sometime have faint red lines near their base.
Slender Yellow Wood-sorrel is not nearly as weedy as Southern Yellow Wood-sorrel (Oxalis dillenii) and Yellow Wood-sorrel (Oxalis stricta).
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15 May 2022
Bull Run Mountains Natural Area Preserve, Haymarket, VA 
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15 May 2022
Bull Run Mountains Natural Area Preserve, Haymarket, VA 
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15 May 2022
Bull Run Mountains Natural Area Preserve, Haymarket, VA (note red markings on petals) 
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15 May 2022
Bull Run Mountains Natural Area Preserve, Haymarket, VA 
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References
1: Flora of North America, Oxalis florida