Botanical Adventures
which took me all over the West for many years...
Packard's mentzelia
Mentzelia packardiae Glad (Loasaceae):
Malheur County, Oregon; in green rocky soil derived from the Succor Creek formation.
Photos,
the original publication,
Wikipedia, and even more information.
Drawing © Judith B. Glad
Mentzelia mollis Peck (Loasaceae):
found in southwestern Idaho and southeastern Oregon, on tuffaceous ash derived from the Succor Creek formation.
More about Mentzelia mollis
Smooth mentzelia
Mentzelia thompsonii Glad (Loasaceae):
found on gray clay of high desert hills along the Utah-Colorado border.
No picture yet, but I'm looking for one. There are some on the web but they are all herbarium specimens, flat and uninteresting to anyone but another botanist. In the field it could pass for Mentzelia mollis, except it has tiny flowers, and doesn't grow in Oregon.
Nelson's checkermallow
Sidalcea nelsoniana Piper (Malvaceae):
I spent nearly ten years chasing this plant. It is found in the Willamette Valley and Coast Range in Oregon, extending a little ways northward into the Puget Trough and Coast Range in Washington. It often grows in roadside ditches, abandoned fields and pastures, and along the occasional ditchbank.
Here's what Wikipedia says about it.