Plantae > Tracheophyta > Magnoliopsida > Gentianales > Apocynaceae > Asclepias > Asclepias subverticillata Asclepias subverticillata (poison milkweed; horsetail milkweed; W. whorled milkweed; western whorled milkweed; whorled milkweed)Synonyms: Asclepias verticillata var. subverticillata (homotypic)
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