ILLUSTRATIONS. 



1. Artemisia abrotanum and A. pontica. 



2. Artemisia californica. 



3. Artemisia norvegica heterophylla, globularia, glome- 



rata, and saxatilis. 



4. Artemisia parryi, A. senjavinensis, and A. maoro- 



botrys. 



5. Artemisia stelleriana and A. alaskana. 



6. Artemisia franserioides and A. vulgaris serrata. 



7. Artemisia vulgaris tilesi and typica. 



8. Artemisia vulgaris heterophylla. 



9. Artemisia vulgaris gnaphalodes and wrighti, and A. 



bigelovi. 



10. Artemisia annua, A. klotzschiana, and A. biennis. 



11. Artemisia absinthium and A. frigida. 



12. Artemisia pattersoni and A. scopulorum. 



13. Artemisia dracunculus typica. 



T4. Artemisia campestris typica and pacifica. 



15. Artemisia campestris borealis, spithamaea, and 



pycnocephala. 



16. Artemisia pedatifida and A. filifolia. 



17. Artemisia spinescens. 



18. Artemisia tridentata typica and parishi. 



19. Artemisia tridentata trifida and nova. 



20. Artemisia tridentata arbuscula and rothrocki. 



21. Artemisia cana. 



22. Artemisia rigida and A. pygmaea. 



23. Artemisia palmeri. 



24. Chrysothamnus paniculatus and C. teretifolius. 



25. Chrysothamnus gramineus and C. vaseyi. 



26. Chrysotliamnus viscidiflorus lanceolatus, puberulus, 



humilis, elegans, stenophyllus, and pumihs. 



27. Chrysothamnus viscidiflorus linifolius and typicus. 



28. Chrysothamnus greenei fiUfolius and C. albidus. 



29. Chrysothamnus pulchellus tjrpicus and C. depressus. 



PLATES 



30. 



Chrysothamnus pyramidatus and C. parryi latior. 

 Chrysothamnus parryi typicus and imulus. 

 Chrysothamnus parryi vulcanicus, nevadensis, asper, 



and howardi. 

 Chrysothamnus nauseosus speciosus and gnaphalodes. 

 Chrysothamnus nauseosus typicus. 

 Chrysothamnus nauseosus graveolens. 

 Atriplex hortensis. 

 Atriplex patula hastata and typica. 

 Atriplex rosea, A. maritima, and A. tatarica. 

 Atriplex semibaccata, A. halimoides, and A. californica. 

 Atriplex phyllostegia, A. dioeca, and A. monihfera. 

 Atriplex tularensi.s, A. tenuissima, A. pusilla, and A. 



parishi. 

 Atriplex gracihflora, A. wolfi, and A. truncata. 

 Atriplex saccaria, A. argentea typica, A. coronata, 



and A. cordulata. 

 Atriplex argentea expansa. 

 Atriplex powelli and A. leucophylla. 

 Atriplex pentandra arenaria, muricata, and typica, 



and A. elegans typica. 

 Atriplex bracteosa, A. wrighti, and A. linifoUa. 

 Atriplex microcarpa, A. fruticulosa, and A. coulteri. 

 Atriplex decumbens, A. matamorensis, and A. bar- 



clayana. 

 Atriplex obovata and A. acanthocarpa. 

 Atriplex nuttalU gardneri, typica, and A. corrugata. 

 Atriplex polycarpa and A. julacea. 

 Atriplex hymenelytra. 

 Atriplex lentiformis breweri and typica. 

 Atriplex lentiformis griffithsi and torreyi. 

 Atriplex oonfertifolia. 

 Atriplex parryi and A. spinifera. 

 Atriplex cauescens typica, aptera, and linearis. 



TEXT-FIGURES. 



1. Phylogenetic chart of the sections of Artemisia. 



2. Achenes of Artemisia. 



3. Leaves of Artemisia vulgaris heterophylla to show 



variation in outline. 



4. Phylogenetic chart of the species of Artemisia, section 



Abrotanum. 



5. Inner bracts of Artemisia norvegica saxatilis. 



6. Phylogenetic chart of the subspecies of Artemisia 



norvegica. 



7. Comparison of leaf -outlines of Artemisia vulgaris 



typica and heterophylla. 



8. Portions of the type specimens of Artemisia vulgaris 



ludoviciana and gnaphalodes. 



9. Phylogenetic chart of the subspecies of Artemisia 



vulgaris. 



10. Leaves of Artemisia vulgaris typica and tilesi. 



11. Leaves of Artemisia vulgaris discolor. 



12. Variation in outline of leaves of Artemisia vulgaris 



gnaphalodes. 



13. Leaves of Artemisia vulgaris gnaphalodes and serrata. 



14. Phylogenetic chart of the species of Artemisia, section 



Absinthium. 



15. Phylogenetic chart of the species of Artemisia, section 



Dracunculus. 



16. Phylogenetic chart of the subspecies of Artemisia 



dracunculus. 



17. Inner bracts of Artemisia campestris pacifica. 



18. Phylogenetic chart of the subspecies of Artemisia 



19. Phylogenetic chart of the species of Artemisia, section 



Seriphidium. 



20. Phylogenetic chart of the subspecies of Artemisia 



tridentata. 



21. Unusual leaves of Artemisia tridentata typica. 



22. Artemisia tridentata trifida and bolanderi and A. cana. 



23. Inner bracts of the involucre of Artemisia tridentata 



bolanderi and A, cana. 



24. Leaves of Chrysothamnus teretifolius and C. albidus. 



25. Phylogenetic chart of the sections and species of 



Chrysothamnus. 



26. Phylogenetic chart of subspecies of Chrysothamnus 



viscidiflorus. 



27. Phylogenetic chart of subspecies of Chrysothamnus 



parryi. 



28. Phylogenetic chart of subspecies of Chrysothamnus 



nauseosus. 



29. Phylogenetic chart of subgenera and smaller divisions 



of Atriplex. 



