The Compass Plant is a small budded yellow flower with many of its friends gathered along a long stem-like a ladder. Its scientific name is Silphium laciniatum but is more commonly known as “Compass Plant” for the belief that the leaves pointed north and south. This may be true most of the time but it is not a reliable way to indicate direction. In our prairie at Cave of the Mounds lives this beautiful plant of pioneers.
Don‘t mistake this sunny looking yellow flower for a sunflower. You can tell the difference by breaking a stem to find a sap or “rosin.” This plant is part of the “rosinweed” family. Also, the seeds grow where the petals were, not in the flat disk at the center of the plant like the sunflower. Like the sunflower, the compass plant grows high in the sky measuring 5-10 feet tall. The flower heads can be 2-5 inches wide. They bloom from July to September. Stems on the compass plant are thick and hairy with flower buds forming opposite each other. The leaves of this plant grow mostly clumped at the bottom near the ground.