Toxic Parts:
soluble oxalates
Flower Color:
  • flower color
meadows, gardens

Time of Greatest Risk


Geographical Distribution

Yellow woodsorrel distribution - United States

Yellow Woodsorrel

Oxalis spp

Common Yellow Oxalis, Upright Yellow-sorrel, Lemon Clover, Prickle Plant
2/ 10
Yellow woodsorrel(Oxalis stricta) is a herbaceous annual or perennial that is native to North America. It looks very similar to shamrocks. It produces yellow flowers with five petals that bloom between May and October. The leaves are usually green, but can also be purplish or brownish red in color. O. stricta will curl up its leaves at night and open them during the day. O. stricta often grows alongside wild violets, cleavers, and wild onions.

Toxic components
O. stricta can be toxic to horses if large amounts are consumed over a short amount of time. All parts of the plant contain oxalic acid (oxalates), which vary in toxicity depending on the stage of growth of the plant, environmental conditions, time of day, and part of the plant.