Euphorbia esula (leafy spurge) , and Conium maculatum (poison 

 hemlock) . An Element Occurrence Record which includes 

 additional data for this population is included as Appendix 1 

 of this report. In addition, slides of the plants and habitat 

 are attached as Appendix 4. Another MPSSC previously known 

 nearby from wetlands along the North Fork of Bluewater Creek, 

 Epipactus gigantea (giant helleborine) , should be searched for 

 at this site. 



In addition to these wetlands, other native plant 

 communities are found within the boundaries of the hatchery. 

 Dryer thickets and woodlands are dominated by Populus sp. 



(cottonwoods) , Prunus virginiana (chokecherry) and Juniperus 

 scopulorum (Rocky Mountain Juniper) . Sagebrush grasslands 

 with Artemesia tridentata and Elymus spicatus as codominants, 

 alkaline gullies and barrens, and rock outcrops are habitats 

 here which may potentially host other MPSSC, especially 

 considering the proximity of the Pryor Mountains. 



Other weedy species found at the hatchery include Kochia 

 scoparia, Cyanoglossum officinale (houndstongue) , Lactuca 

 serriola (prickly lettuce) , and Glycyrrhiza lepidota 



(licorice). This last species was reported by hatchery 

 personnel to be increasing at the site in recent years. 



Boulder Forks Fishing Access Site 



Habitat types at this site along the Boulder River 

 consist of floodplain woodlands, thickets, mudflats and gravel 

 bars, and hay meadows. The woodlands are dominated by Populus 

 balsamifera (Balsam Poplar) with an understory of Crateagus 

 sp. (hawthorn) and Alnus incana (alder) and many native 

 herbaceous elements. The thickets are dominated by Salix 

 lutea and Salix exigua (willows) , and the mudflats by Phalaris 

 arundinacea (canary reedgrass) . Weeds in these habitats are 

 not a great problem, however, Arctium minus (burdock) and 

 Cirsium vulgare (bull thistle) were observed. Most of the 

 open ground at this site was historically managed for hay. 

 Cultivated species found in these meadows include Bromus 

 inerwis (smooth brome) , Dactylis glomerata (orchardgrass) , 

 Phleum pratense (timothy) , and Trifolium pratense (red 

 clover) . Weedy species include Bromus tectorum (downy brome) , 

 Cirsium arvense (Canada thistle) , Cyanoglossum officinale 

 (houndstongue) , Lychnis alba (white campion) , and Tragopogon 

 dubius (salsify) . The weed problem at this site is not great 

 at this time; leasing the open areas for hay seems an 

 appropriate means of retaining this status and is compatible 

 with recreation. If weed control measures are taken in the 

 woody habitats (although this is not recommended) care should 

 be taken not to disturb the diverse native flora. The 

 potential for MPSSC in these habitats is low. 



Bratten Fishing Access Site 



This area occupies bottomlands along the Yellowstone 

 River. The presence of an old homestead is evidenced by 



