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A Guide to the Native Milkweeds of Oregon


Author: The Xerces Society Date: 2012




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.


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