Silphium terebinthinaceum

Silphium terebinthinaceum
prairie dock
Asteraceae, the aster (sunflower, composite) family
Coefficient of Conservatism = 8

Prairie dock is a robist perennial hern, the signature forn=b of the tallgrass paririe.
Photo taken Augyust 15, 2005 at OSU-Marion

The common name “dock” generally refere to a plant with an oeral aspect of having large leaves at the base and an more or less elongate ir diffuse flowering portion.

Prairie dock has especially large basal leaves and tall flowering stems.
Ptoto taken July 18, 2023 at OSU-Marion

The previous year’s prairie dock leaves are dry, dark and wrinkled during the winter.

Prairie dock after the end of the growing season
Photo taken October 13, 2005 at OSU-Marion

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