PAGE 



Genus Chrysothamnus — Continued. 



Leaves 169 



Stem and bark 169 



Roots 169 



Pubescence 170 



Resins, oils, and other physiological products. . . . 171 



Habit 171 



Fixity of species and subspecies and of their 



characters 171 



Generic diagnosis 174 



Key to the sections and species of Chrysothamnus. 175 



Section I. Punctati 175 



1. Chrysothamnus paniculatus 175 



Description 175 



Distribution 175 



Relationships 176 



Ecology and uses 176 



2. Chrysothamnus teretifohus 176 



Section II. Typici 178 



3. Chrysothamnus gramineus 178 



4. Chrysothamnus vaseyi 179 



5. Chrysothamnus viscidiflorus 180 



6. Chrysothamnus greenei 190 



7. Chrysothamnus albidus 192 



Section III. Pulchelli 192 



8. Chrysothamnus pulchellus 193 



9. Chrysothamnus depressus 195 



Section IV. Nauseosi 195 



10. Chrysothamnus pyramidatus 197 



11. Chrysothamnus parryi 198 



12. Chrysothamnus nauseosus 209 



Genus Atriplex 235 



History and generic limits 235 



Origin and development of sections 237 



Criteria for recognition of species and subspecies. . . 240 



Seed 241 



Flowers 242 



Fruiting bracts 240 



Inflorescence 243 



Leaves 243 



Pubescence 243 



Habit 243 



Generic diagnosis 244 



Artificial key to species of Atriplex 244 



1. Atriplex hortensis 247 



Description 247 



Distribution 247 



Minor variations and synonyms 247 



Relationships 248 



Ecology and uses 248 



Genus Atriplex— 



2. Atripl 



3. Atrip 



4. Atrip 



5. Atrip 



6. Atrip 



7. Atrip 



8. Atrip 



9. Atrip: 



10. Atrip 



11. Atripl 



12. Atrip 



13. Atrip 



14. Atrip: 



15. Atrip 



16. Atrip: 



17. Atrip: 



18. Atrip: 



19. Atrip 



20. Atrip: 



21. Atrip: 



22. Atrip: 



23. Atrip: 



24. Atrip 



25. Atrip 



26. Atrip: 



27. Atrip 



28. Atrip: 



29. Atrip: 



30. Atrip 



31. Atrip 



32. Atrip 



33. Atrip 



34. Atrip 



35. Atrip 



36. Atripl 



37. Atrip 



38. Atrip 



39. Atrip 



40. Atripl 



41. Atrip 



42. Atrip 



43. Atrip 



44. Atripl 



45. Atrip 



46. Atrip 



47. Atrip 



PAGE 



Contintted. 



iex patula 248 



lex cabfornica 257 



ex maritima 258 



lex rosea 259 



lex tatarica 261 



lex semibaccata 262 



lex halimoides 263 



ex dioeca 264 



monilifera 265 



lex phyllostegia 266 



lex cordulata 269 



ex tularensis 271 



expusilla 272 



tenuissima 273 



parishi 274 



ex truncata 276 



ex wolfi 279 



ex gracihflora 279 



ex saccaria 280 



ex argentea 282 



ex coronata 288 



ex poweUi 290 



ex leucophyUa 292 



ex pentandra 294 



ex elegans 300 



ex microcarpa 303 



wrighti 304 



bracteosa 305 



ex linifolia 308 



ex f ruticulosa 309 



ex coulteri 310 



decumbens 311 



ex matamorensis 312 



ex barclayana 313 



ex acanthocarpa 320 



ex obovata 321 



ex nuttaUi 322 



ex corrugata 330 



ex polycarpa 331 



ex julacea 333 



ex hymenelytra 333 



ex lentif ormis 334 



ex conf ertif olia 338 



ex spinifera 340 



ex parryi 341 



ex canescens 342 



