Umpqua Mariposa Lily – Oregon Conservation Strategy

Photo Credit: Oregon Department of Agriculture

Overview

Species Common Name Umpqua Mariposa Lily
Species Scientific Name Calochortus umpquaensis
Federal Listing Status Species of Concern
State Listing Status Endangered

Ecoregions

Klamath Mountains

The Klamath Mountains ecoregion covers much of southwestern Oregon, including the Umpqua Mountains, Siskiyou Mountains, and interior valleys and foothills between these and the Cascade Range. The Rogue watershed has the largest population of any coastal watershed in Oregon (Jackson County, Josephine County, and a portion of Curry County). Several popular and scenic rivers run …

West Cascades

The West Cascades ecoregion extends from east of the Cascade Mountains summit to the foothills of the Willamette, Umpqua, and Rogue Valleys, and spans the entire length of the state of Oregon. It is largely dominated by conifer forests, moving into alpine parklands and dwarf shrubs at higher elevations.

Special needs

The Umpqua mariposa lily occurs in grassland-forest ecotones on serpentine soils. This species can be found in a broad range of habitat types, from closed-canopy coniferous forests to open grass-forb meadows.

Limiting factors

The Umpqua mariposa lily is threatened by grazing, logging, nickel mining, road construction, herbicide drift from applications on adjoining private land, and invasive plants. Fire suppression leading to encroachment of woody vegetation adversely affects this species. Bulb digging by collectors poses an additional threat.

Data gaps

Identify factors limiting distribution (reproduction, fecundity, etc.). Develop propagation and transplanting protocols.

Conservation actions

Continue to implement the interagency Conservation Agreement. Manage grazing and logging in sensitive areas. Establish long-term monitoring. Collect/store seed from all populations. Survey for new populations.

Key reference or plan

Oregon Department of Agriculture Plant Conservation