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narrow-leaved green milkweed

narrow-leaved green milkweed (Asclepias stenophylla) [state endangered]
Photo © Gerald Tang

Features and Behaviors

Narrow-leaved green milkweed grows up to three feet in height. Pairs of leaves are arranged opposite each other on the stem. Seedpods are up to five inches in length. Flowers are positioned in the leaf axils and are white in color.

Narrow-leaved green milkweed flowers June through July. This species grows in a few counties in west central Illinois in hill prairies and upland woods along the Mississippi River. Narrow-leaved green milkweed reaches its northeastern range limit in the state. It is endangered in Illinois.

Illinois Range


​Kingdom: Plantae
Division: Magnoliophyta
Class: Magnoliopsida
Order: Gentianales
Family: Asclepiadaceae

Illinois Status: state endangered, native