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Plant Resources

Plant resources include forestland, pastureland, hay lands, and rangelands as well as special status plants. For the purposes of this document special status plants include those on the Federal Threatened and Endangered species list as well as the Idaho Native Plant Society list, and Idaho Fish and Game sensitive species list.

Resource concerns associated with grazing lands are improper grazing management and noxious weed infestations. There are over 20 listed noxious weeds in the District. The District encourages integrated pest management strategies.

Conservation treatment is needed on a majority of grazing lands. Planned grazing systems, weed control, cross fencing, stock water developments, re-seeding and deferred grazing are all methods that may be used to maintain areas.

Special Status plants

Twenty-four plants listed as threatened, endangered, or species of concern are located within the District (see table below). The species listed represent known occurrences and do not represent potential distributions within the county.

Plants listed as threatened, endangered or species of concern in the District1.

Common NameScientific Name
Bank monkeyflowerMimulus clivicola
Broad fruit mariposaCalochortus nitidus
Constance’s bittercressCardamine constancei
Dwarf gray rabbit brushChrysothamnus nauseosus ssp nanus
Douglas’ CloverTrifolium douglasii
Fern leaved desert-parsleyLomatium dissectum var dissectum
Giant HelliborineEpipactis Gigantea
Green band mariposa lilyCalochortus macrocarpus var maculosus
Idaho HawksbeardCrepis Bakerissp Idahoensis
Jessica’s asterAster jessicae
Palouse GoldenweedHaplopappus Liatriformis
Palouse thistleCirsium brevifolium
Pipers MilkvetchAstragulus Riparius
Plumed cloverTrifolium plumosum var amplifolium
Purple thick-leaved thelypodyThelypodium lanciniatum var streptanthoides
Salmon-flowered desert-parsleyLomatium salmononiflorum
Simpson’s hedgehog cactusPediocactus simpsonii var robustior
Spacious monkeyflowerMimulus washingtonensis ssp 1
Spalding’s SileneSilene Spaldingii
Stalk leaved MonkeyflowerMimulus patulus
Sticky GoldenweedHaplopappus Hirtus Var Sonchifolius
Wolf’s currantRibes wolfii

1Idaho Conservation Data Center. 2004. Special Status Plants. Idaho Department of Fish and Game, Boise.

While data regarding these plants is limited, the District encourages land managers to become familiar with the plants and the adoption of practices to protect the plants. One of the long-term resource needs in the District is a comprehensive management plan regarding the plants which identifies potential habitat locations, management needs and protection measures.

Additional sources of information regarding special status plants and native plants.

White Pine Chapter of the Idaho Native Plant Society
Palouse Prairie Foundation

Weeds

Noxious weed species are identified by the Idaho State Department of Agriculture (ISDA). Here is a noxious weed list for Idaho from the Idaho Weed Awareness Campaign website.

The District is part of three cooperative weed management areas: Tri-State Demo, Clearwater Basin, and Palouse.

Figure CWMA illustrates the location of each area within the county.

Figure CWMA. Locations of Idaho’s Cooperative Weed Management Areas2

image

2Source State of Idaho Noxious Weed Images

A Cooperative Weed Management Area (CWMA) is a distinguishable hydrologic, vegetative, or geographic zone based upon geography, weed infestations, climatic or human-use patterns. A CWMA may be composed of a portion of a county, a county, portions of several counties, or portions of more than one state. CWMAs are formed when the landowners and land managers of a given area come together and agree to work cooperatively to control weeds.

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