124 MONTANA AGRICULTURAL COLLEGE SCIENCE STUDIES. 



Poverty-weed; Iva axillaris, Pursh ; Monolepis chenopodioides, Moq. 



Prairie Apples; Astragalus caryocarpus, Ker. 



Prairie Bean; Thermopsis rhombifolia, Xutt. 



Prairie Star; Tellima parviflora, Hook. 



Prickly Lettuce; Lactuca Scariola, L. 



Purple Heather; Bryanthus empetriformis, Gray. 



Prickly Pear; Opuntia polyacantha platycarpa, Coult. and oilier 



species. 



Prince's Pine; Chimaphila umbellata, Nutt. 

 Quaker Bonnet; Lupinus species. 

 Quaking Asp; Populus tremnloides, Michx. 

 Rabbit-weed; Bigelovia graveolens, Gray. 

 Racine amare; Lewisia rediviva, Pursh. 



Ragweed; Ambrosia artemisisefolia, L; Erigeron Canadensis-, L. 

 Rayless Dogfennel; Matricaria discoidea, DC. 

 F^ttlesnake-weed; Ecbinacea angustifolia, DC. 

 Rattleweed; Astragalus frigidus Americanus, Gray with dry fruit. 

 Red Cedar; Juniperus scopulorum, Sarg. and J. Virginiana. L. 

 Red Columbine; Aquilegia flavescens, Wats. 

 Red-cup Mariposa Lily; Calochortus Nuttallii, T & G. 

 Red Fir; Pseudotsuga mucronata, Sudw. 

 Red Haw; Crataegus coccinea, L. 

 Red-head Louisa; Lewisia rediviva, Pursh. 

 Red Huckleberry; Yaccinnum scoparium, Leiberg. 

 Red Loco; Oxytropis Blankinshipii, (Nelson). 

 Red Monkey-flower; Mimulus Lewisii, Pursh. 

 Red Willow; Cornus stolonifera, Michx. 

 Reed Grass; Phragmites communis, Trin. 

 Ribgrass; Plantago Patagonica gnaphalioides, Gray. 

 River Cottonwood; Populus deltoidcs, Marsh. (Eastern plains.) 

 Rock-rose; CEnothera csespitosa, Nutt. 

 Rockweed; Balsamorrhiza sagittata, Nutt. 



Rosinweed; Grindelia squarrosa, Dunal. ; Madia glomerata, Hook. 

 Rush; Equisetum l?evigatum, A. Br. 

 Russian Thistle; Salsola Kali Tragus, Moq. 



Rye-grass; Aoropyron tenerum, Vasey; Elymus condensatus, Presl. 

 Sage-brush; Artemisia tridentata, Nutt.; A. cana, Pursh and other 



species. 



Salmonberry ; Rubus Nutkanus, Moc. 

 Salsify; Tragopogon porrifolius, L. 

 Saltgrass; Distichlis spicata, Greene. 



