Scoliopus hallii, the Oregon fetid adderstongue, is a plant species endemic to western Oregon.Biota of North America Project It is closely related to the California fetid adderstongue, Scoliopus bigelovii, but has yellow flowers with thin purple stripes rather than the purple flowers with yellow stripes as in S. bigeloviiWatson, Sereno. 1879. Proceedings of the American Academy of Arts and Sciences 14: 272
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