silphium laciniatum

Silphium laciniatum is a species of flowering plant in the aster family known commonly as compassplant or compass plant. It is native to North America, where it occurs in Ontario in Canada and the eastern and central United States as far west as New Mexico. Other common names include prairie compass plant, pilotweed, polarplant, gum weed, cut-leaf silphium, and turpentine plant. It is a rosinweed of genus Silphium.

This plant is a taprooted perennial herb producing rough-haired stems usually one ...