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Abbreviated from Illinois wildflowers website: 2- 6' in height, native, unbranched. Central stem is stout, pale green and usually short -pubescent. Prominent central vein along length of leaf, veins radiate out to smooth margins. Oozes a milky sap when stem or leaves are torn. Seedpods are 3 to 4" long and covered with soft prickles and short woolly hairs. (From Illinios Wildflower information site.)
Photo taken at Eaton Preserve - prairie. Roadsides, dry soil and fields.
Family - Asclepiadaceae Order - Gentianales Class - Phylum - Range in North America is Canada and south.