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 |
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