Yellow Pimpernel -- Taenidia integerima

Features: This uncommon plant prefers poor soil and does not like competition from taller plants. It has distinctive unlobed leaves. Clusters of tiny yellow flowers attract small spring pollinators, including many types of  native bees and flies. This plant is in the carrot family and, like Golden Alexanders and Heart-leaved Meadow Parsnips, is a host plant for Eastern Black Swallowtail caterpillars

Light: Part shade

Soil: Dry

Height: 1-3 feet

Blooms: May to June

See more information and photos at Illinois Wildflowers and USDA Plants Database