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Slender Yellow Wood Sorrel (Oxalis dellenii)
Wood Sorrel is a native, perennial wildflower in Wisconsin that brings a splash of vibrant yellow to prairies, plains, meadows, pastures, savannas, and woodland edges. Growing between six and fifteen inches tall, its delicate half-inch-wide flowers, each with five petals, brighten the landscape. The plant's clover-like leaves make it easy to identify, and they contribute to its reputation among gardeners. While some gardeners appreciate Wood Sorrel for its resilience and ability to thrive in dry soils under full sun, others see it as a persistent guest in their gardens. Its rapid growth and tendency to spread can make it feel more like an enthusiastic wanderer than a planned addition.
Sources:
USDA Plants Database – Oxalis dillenii Species Profile
Lady Bird Johnson Wildflower Center – Native Plant Database: Slender Yellow Wood Sorrel
Minnesota Wildflowers – Slender Yellow Wood Sorrel Identification and Habitat
Illinois Wildflowers – Yellow Wood Sorrel Ecology and Growth Habit
Wisconsin DNR – Native Prairie and Savanna Wildflowers of Southern Wisconsin
Iowa State University Extension – Oxalis Species and Their Ecological Roles
Sauk Prairie Conservation Alliance – Prairie Edge Plant Communities and Early‑Season Wildflowers
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