based on the habitat model done by the Colorado Section 7 Range – Natural Heritage Program Comments Suitability cannot be determined when soils are wet and so – surveys should not be done during these times High Suitability (places where plants are often found) Soils white shale barrens – Tongues Thirteenmile Creek, Dry Fork, Garden Gulch, Parachute – 20 meters in high or Creek, Yellow Creek moderate suitability Geology where the Thirteenmile Creek Tongue and Parachute Creek – habitat Member of the Green River Formation are exposed along downcutting drainages 30 meters in marginal Aspect various, typically south facing – habitat although all Slope moderate to steep slopes – slopes and aspects must Elevation 1,806 to 2,255 m (5,960 to 7,440 ft) – be included in line of Habitat - barren areas often with less than 5% vegetation (ground sight cover), although higher in some sites in sagebrush-steppe alluvial areas Dudley Bluffs Common Associates Physaria Ericameria nauseosa, Mentzelia multicaulis, – Mid May - June High and moderately twinpod obcordata Pascopyrum smithii, Atriplex canescens, Cirsium barnebyi, Abronia suitable habitat should argillosa, Achnatherum hymenoides, Eriogonum longifolium, be mapped as polygons Sphaeralcea coccinea, Astragalus lutosus if larger than 100 square (places where plants are occasionally found) Moderate Suitability meters but can be Tongues alluvial deposits associated with the tongues listed above; – mapped as a point if less areas that are mapped as Green River but resemble Uintah than 100 square meters. Aspect typically south, less often north – Mapped areas should be Slope flatter areas such as lower and upper slopes generally around – identified as either high steep occupied habitat or moderate suitability. Other Characteristics as above, possibly higher or lower elevations – Proximity generally closer to occupied habitat than marginal habitat – Marginal Habitat (places with some suitable characteristics but where no plants have been found) Tongues Uintah, Black Sulphur, other Green River Tongues not listed – above Other Characteristics as above, possibly higher or lower elevations – Proximity further from occupied habitat than moderate or high –
Physaria obcordata Dudley Bluffs twinpod Mid May - June 20 meters in high or moderate suitability habitat 30 meters in marginal habitat although all slopes and aspects must be included in line of sight High and moderately suitable habitat should be mapped as polygons if larger than 100 square meters but can be mapped as a point if less than 100 square meters. Mapped areas should be identified as either high or moderate suitability. Section 7 Range – based on the habitat model done by the Colorado Natural Heritage Program Comments – Suitability cannot be determined when soils are wet and so surveys should not be done during these times High Suitability (places where plants are often found) Soils – white shale barrens Tongues – Thirteenmile Creek, Dry Fork, Garden Gulch, Parachute Creek, Yellow Creek Geology – where the Thirteenmile Creek Tongue and Parachute Creek Member of the Green River Formation are exposed along downcutting drainages Aspect – various, typically south facing Slope – moderate to steep slopes Elevation – 1,806 to 2,255 m (5,960 to 7,440 ft) Habitat - barren areas often with less than 5% vegetation (ground cover), although higher in some sites in sagebrush-steppe alluvial areas Common Associates – Ericameria nauseosa, Mentzelia multicaulis, Pascopyrum smithii, Atriplex canescens, Cirsium barnebyi, Abronia argillosa, Achnatherum hymenoides, Eriogonum longifolium, Sphaeralcea coccinea, Astragalus lutosus Moderate Suitability (places where plants are occasionally found) Tongues – alluvial deposits associated with the tongues listed above; areas that are mapped as Green River but resemble Uintah Aspect – typically south, less often north Slope – flatter areas such as lower and upper slopes generally around steep occupied habitat Other – Characteristics as above, possibly higher or lower elevations Proximity – generally closer to occupied habitat than marginal habitat Marginal Habitat (places with some suitable characteristics but where no plants have been found) Tongues – Uintah, Black Sulphur, other Green River Tongues not listed above Other – Characteristics as above, possibly higher or lower elevations Proximity – further from occupied habitat than moderate or high
Plant_Guidance_030613.docx