General Key to the Families 23 



4. P. dissecta var. multisecta. (Wats.) Rydb. Dis- 



sected Cinquefoil. 



5. P. dissecta var. pinnatisecta. Leafy Cinquefoil. 



6. P. arguta. Pursh, Tall Cinquefoil. 



7. P. norvegica. (L.) Rydb, Rough Cinquefoil. 



8. P. Hippiana. Lehm. Woolly Cinquefoil. 



9. P. gracilis. Dougl. Graceful Cinquefoil. 



10. P. nivea. L. Alpine Cinquefvil. 



11. P. uniflora. Ledeb. One-Hozvered Cinquefoil. 



12. P. fruticosa. L. Shrubby Cinquefoil. 



13. P. palustris. (L.) Scop. Purple Cinquefoil. 

 IX. Geum. L. 



1. G. triflorum. Pursh. Long-plumed Avens. 



2. G. strictum. Ait. Yellozv Avens. 



3. G. macrophyllum. Willd. Large-leaved Avens. 



TRIBE RUBE^ 



X. RuBus. (Tourn.) L. 



1. R. parviflorus. Nutt, Capberry. 



2. R. strigosus. Michx. Red Raspberry. 



3. R. triflorus. Richards. Dwarf Raspberry. 



4. R. pedatus. Smith. Creeping Raspberry. 



5. R. arcticus. L. Arctic Raspberry. 



6. R. spectabilis. Pursh. Salmonberry. 



TRIBE ROSE^ 

 XL Dryas. L. 



1. D. octopetala. L. Wood Nymphs. 



2. D. Drummondii. Richards. Drummond's Dryas. 

 XII. Rosa. (Tourn.) L. 



1. R. acicularis. Lindl. Prickly Rose. 



2. R. Macounii. Macoun's Rose. 



3. R. gymnocarpa. Nutt. Tiny Rose. 



TRIBE PRUNED 



XIII. Prunus. (Tourn.) L. 



I. P. demissa. (Nutt.) Dietrich. Western Choke 

 Cherry. 



