| | | Kind of type | Full locality |
| | | [not recorded as a type] | Northwestern U.S.A., Oregon: Woodruff Meadow, 30 mi SW Crater Lake |
| | | [not recorded as a type] | Northwestern U.S.A., Oregon: Woodruff Meadow, 30 mi SW Crater Lake |
| | | [not recorded as a type] | Northwestern U.S.A., Oregon: Corvalis, 6 mi N |
| | | holotype of species Steiroxys strepens Fulton, 1930 | Northwestern U.S.A., Oregon, Benton County: 6 mi N of Corvalis, Top of Jackson's Hill |