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Special Status Species Known or Likely to Occur in the Challis Field Office

Species	Type	Vegetation Type / Habitat	Soil Characteristics
Lemhi Milkvetch (Astragalus aquilonius)	2	Most abundant on gentle slopes near Challis, but also on steep erosive slopes and in washes; generally south facing, dry	Challis volcanic weathering; limestone gravelly slopes and shallow sandy loams
Welsh’s buckwheat (Eriogonum capistratum var. welshii)	2	Alluvial fans of Big Lost River Range	Calcareous gravels
Alkali primrose (Primula alcalina)	2	Spring-fed calcareous headwaters system	Highly alkaline clay
Challis Milkvetch (Astragalus amblytropis)	3	Steep erosive slopes, little vegetated, south facing, dry	Challis volcanic weatherings including rhyolitic and andesitic weatherings
Meadow Milkvetch (Astragalus diversifolius)	3	Alkaline wet meadows	Soils often alkaline with obvious whitish deposits
Blue gramma (Bouteloua gracilis)	3	Unknown	Unknown
Chatterbox orchid (Epipactis gigantean)	3	Springside, thermal springs	Limestone weatherings
Marsh felwort (Lomatogonium rotatum)	3	Spring-fed calcareous headwaters system	Highly alkaline clay
Challis crazyweed (Oxytropis besseyi var. salmonensis)	3	Steep (30%) to more gentle slopes, generally south facing, or in washes. Usually dry, sparcely vegetated, open communities	Sandy to gravelly erosive substrates derived from Challis volcanics
Wavy leaf thelypody (Thelypodium repandum)	3	Steep erosive slopes, little vegetated, south facing dry	Challis volcanic weatherings, including rhyolitic and adesitic weatherings
Pale sedge (Carex livida)	4	Unknown	Unknown
White eatonella (Eatonella nivia)	4	Mid-elevation desert	Sandy to gravelly thin soil, often on basalt
Hoary willow (Salix candida)	4	Spring-fed calcareous headwater wetland systems	High alkaline clay
Rush aster (Aster juncuformis, Symphyotrichum boreale)	4	Unknown	Unknown

Challis Field Office  |  1151 Blue Mountain Road |  Challis, ID 83226
208-879-6200  |  Fax: 208-879-6219 |  Office hours: 7:45am - 4:30pm, M-F