Five species of milkweed are native to Oregon. This guide includes profiles of the four most common species, all of which are used as a larval host plant by the monarch butterfly.
Asclepias cordifolia (purple milkweed, heartleaf milkweed)
Asclepias cryptoceras ssp. davisii (Davis’ milkweed)
Asclepias fascicularis (narrow-leaved milkweed)
Asclepias speciosa (showy milkweed)
A profile of each of these species includes descriptions of flowers, leaves, and seed pods, accompanied by photos and distribution maps. Supporting these profiles is a simple guide to identifying milkweeds based on their distinctive flowers and fruits.
Download PDF: A Guide to the Native Milkweeds of Oregon (836 KB)