The false shamrock plant (oxalis triangularis) is a bulb type flowering plant which is also known as the purple shamrock or wood sorrel from the oxalis genus. Current Facts Purple Butterfly sorrel, botanically classified as Oxalis regnelli "Triangularis," is a perennial plant that is a member of the Oxalidaceae, or wood sorrel … This includes Pink-sorrel and similar species with pink flowers and larger leaves, as well as yellow flowered species that are fairly common in flower beds. There is a small purple variety called Creeping Wood Sorrel … Seasons/Availability Purple Butterfly sorrel is available year-round. Both the flowers and leaves open up on sunny days, otherwise they fold up and "go to sleep." https://nature.mdc.mo.gov/discover-nature/field-guide/violet-wood-sorrel Other Wood Sorrel species within the state have yellow flowers. Oxalis, also known as wood sorrel, is a perennial weed that is often mistaken for clover. It is easily distinguished from clover by the 3 heart-shaped leaflets found on top of each long stalk (or petiole) … Comments: In Illinois, this is the only Oxalis sp. The small pinkish or white colored blooms are an attractive addition to the rich purple … (Wood Sorrel) that has lavender or pale purple flowers. Purple Butterfly sorrel is crisp and acidic with a lemony taste and a slightly sweet undertone. Violet Wood Sorrel …