CONTENTS 



Page 



INTRODUCTION 1 



METHODS 2 



CHARACTERISTICS OF THE GENUS ARTEMISIA (SAGEBRUSH) . 3 



Artemisia arbuscula Nutt. (low sagebrush) 6 



Artemisia bigelovii Gray. (Bigelow sagebrush) 9 



Artemisia cana Pursh. (silver sagebrush) 10 



Artemisia filifolia Torr. (sand sagebrush) 12 



Artemisia frigida Wilid. (fringed sagebrush) 13 



Artemisia longiloba (Osterhout) Beetle (alkali sagebrush) . 16 



Artemisia nova Nelson (black sagebrush) 17 



Artemisia pygmaea Gray (pigmy sagebrush) 19 



Artemisia rigida (Nutt. ) Gray (stiff or scab land sagebrush). 20 



Artemisia rothrockii Gray (timberline sagebrush). .... 23 



Artemisia spinescens Eaton (budsage) 24 



Artemisia tridentata Nutt. (big sagebrush) 26 



Artemisia tripartita Rydb. (threetip sagebrush) 34 



Artificial hybridization in section Tridentatae of 



Artemisia 35 



CHARACTERISTICS OF THE GENUS CHRYSOTHAMNUS 



(RABBITBRUSH) 36 



Chrysothamnus albidus (Jones) Greene (alkali or white 



flowered rabbitbrush) 39 



Chrysothamnus depressus Nutt. (dwarf rabbitbrush) .... 39 

 Chrysothamnus greenei Nutt. (Gray) Greene (Greenes 



rabbitbrush) 41 



Chrysothamnus linifolius Greene (spreading rabbitbrush). . 42 

 Chrysothamnus nauseosus (Pallas) Britt. (rubber 



rabbitbrush) 43 



Chrysothamnus parryi (Gray) Greene (parry rabbitbrush) . 51 



Chrysothamnus vaseyi (Gray) Greene (vasey rabbitbrush) . 53 

 Chrysothamnus viscidiflorus (Hook.) Nutt. (low 



rabbitbrush) 54 



CHARACTERISTICS OF THE GENUS TETRADYMIA 



(HORSE BRUSH) 58 



Tetradymia canescens DC. (Gray horsebrush) 59 



Tetradymia glabrata Torr. & Gray (littleleaf horsebrush) . 60 



