Tall green milkweed, Asclepias hirtella
Common names: Barrens milkweed
Tall green milkweed grows in full sun in sandy or rocky, calcareous soils of prairies and marshy areas. It is not rare or threatened but the seeds are difficult to come by since they are seldom collected from their host plants on the prairie. Seeds are available thru this Amazon product banner.
View Tall green milkweed observations on iNaturalist
View Tall green milkweed plant information at Wildflower.org
View Tall green milkweed plant information at Plants.USDA.gov