Silphium laciniatum L.

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Silphium laciniatum is a species of flowering plant in the family Asteraceae 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.

Description

This plant is a taprooted perennial herb producing rough-haired stems usually one to three meters tall. The leaves are variable in shape and size, being 4 to 60 cm (1+1⁄2 to 23+1⁄2 in) long and 1 to 30 cm (1⁄2 to 11+3⁄4 in) wide. They are hairy, smooth-edged or toothed, and borne on petioles or not. The back of the flower head has layers of rough, glandular phyllaries. The head contains 27 to 38 yellow ray florets and many yellow disc florets. The fruit is a cypsela which can be almost 2 cm (3⁄4 in) long and is tipped with a pappus of two short awns.

 

Silphium laciniatum - Wikipedia

https://youtu.be/ZAEbNBwIENo?t=325