COMMON NAMES OF MONTANA PLANTS. 137 



Potamogeton spp. Fishweed. 



Pteris aquilina, L. Brake Fern. 



Potentilla spp. Five-finger. 



Potentilla fruticosa, L. Yellow Rose. 



Primus Americana, Marsh. Wild Plum. 



Prunus demissa, Walp. Choke Cherry. 



Pyrola uliginosa, Torr. Wintergreen. 



Pseudotsuga mucronata, Sudw. Red Fir ; Douglas Fir. 



Psoralea esculenta, Pursh. Indian Turnip; Bread-root; Ponime 

 Blanche or Pomme de Prairie (French Voyageur). 



Pyrus sambucifolia, Cham. & Schl. Mountain Ash. 



Ranunculus spp. Buttercup. 



Kibes Americanum. Mill. Black Currant. 



Ribes aureunr, Pursh. Yellow Currant. 



Ribes cereum, Dougl. and R. viscosissimum. Pursh. Sticky or Vis- 

 cid Currant. 



Ribes setosum, Lincll. Wild Gooseberry. 



Rhus Rydbergii, Small and R. Toxicodendron, L. Poison Oak. 



Rhus trilobata, Nutt. Sweet Sumac. 



Rosa spp. Wild Rose. 



Rubus Nutkanus, Moc. Salmonberry ; Shadberry. 



Rubus strigosus, Michx. Wild Red Raspberry. 



Rudbeckia laciniata, L. Black-eyed Susan; Cone-flower; Nigger- 

 head. 



Rudbeckia occidentalis, Nutt. Nigger-head. 



*Rumex crispus, L. and R. salicifolius, Weinm, Dock. 



Rumex venosus, Pursh. Sour Greens; Wild Begonia; Wild Hy- 

 drangea. 



Sagittaria arifolia, Nutt. Arrow-leaf; White Water Lily; Swan or 

 Swamp Potato; Wappatoo (Ind.). 



Salix spp. Wallow. 



Salix Mackenziana, Barratt. Diamond Willow. 



Salsola Kali Tragus, Moq. Russian Thistle. 



Sambucus glauca, Nutt. Elder ; Elderberry. 



Saponaria Vaccaria, L. Cockle ; Cow Cockle. 



Sarcobatus vermiculatus, Torr. Greasewood. 



Scirpus lacustris occidentalis, Wats. Bulrush ; Tule. 



Shepherdia argentea, Nutt. Buffalo Berry; Bull-berry; Graisse de 

 Boeuf (Fr.). 



^Sisymbrium altissimum, L. Tumbling Mustard. 



