silphium integrifolium

Silphium integrifolium is a species of flowering plant in the aster family, Asteraceae. Its common names include rosinweed, whole-leaf rosinweed, entire-leaf rosinweed, and prairie rosinweed. It is native to eastern North America, including Ontario in Canada and the eastern and central United States as far west as New Mexico.

This species is a perennial herb growing from a fibrous root system and producing stems up to 2 meters (6 ft 7 in) tall. It can form a large clump of up to 100 stems. The stems ...