II 



CONTENTS 



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. Punetati 175 



1. Chrysothamnus pauiculatus 175 



Description 175 



Distribution 175 



Relationships 176 



Ecology and uses 176 



2. Chrysothamnus teretifolius 176 



Section II. Typici 178 



3. Chrysothamnus gramineus 178 



4. Chrysothamnus vaseyi 179 



5. Chrysothamnus viscidiflorus 180 



t). Chrysothamnus greenei 190 



7. Chrysothamnus albidus 192 



Section III. PulchelU 192 



8. Chrysothamnus pulchellus 193 



9. Chrysothamnus depressus 195 



Section IV. Nauseosi 195 



10. Chrysothamnus pyramidatus 197 



11. Chrysothamnus parryi 198 



12. Chrysothanmus nauseosus 209 



Genus Atriple.\ 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 



PAGE 



Genus Atriplex — Continued. 



2. Atriplex patula 248 



3. Atriplex caUfornica 257 



4. Atriplex maritima 258 



5. Atriplex rosea 259 



6. Atriplex tatarica 261 



7. Atriplex semibaccata 262 



8. Atriplex halimoides 263 



9. Atriplex dioeca 264 



10. Atriplex monihfera 265 



11. Atriplex phyllostegia 266 



12. Atriplex cordulata 269 



13. Atriplex tularensis 271 



14. Atriplex pusilla 272 



15. Atriplex tenuissima 273 



16. Atriplex parish! 274 



17. Atriplex truncata 276 



18. Atriplex wolfi 279 



19. Atriplex graciliflora 279 



20. Atriplex saccaria 280 



21. Atriplex argentea 282 



22. Atriplex coronata 288 



23. Atriplex powelU 290 



24. Atriplex leucophyUa 292 



25. Atriplex pentandra 294 



26. Atriplex elegans 300 



27. Atriplex microcarpa 303 



28. Atriplex wrighti 304 



29. Atriplex bracteosa 305 



30. Atriplex linifolia 308 



31. Atriplex fruticulosa 309 



32. Atriplex coulteri 310 



33. Atriplex decumbens 311 



34. Atriplex matamorensis 312 



35. Atriplex barclayana 313 



36. Atriplex aoanthocarpa 320 



37. Atriplex obovata 321 



38. Atriplex nuttalli 322 



39. Atriplex corrugata 330 



40. Atriplex polycarpa 331 



41. Atriplex julacea 333 



42. Atriplex hymenelytra 333 



43. Atriplex lentiformis 334 



44. Atriplex confertif oUa 338 



45. Atriplex spinifera 340 



46. Atriplex parryi 341 



47. Atriplex canescens 342 



