1907] Hall. Compositae of Southern California. 17 



Bracts of the involucre with distinct green tips. 



Leaves terete, resinous-punctate 



....Chrysothamnus teretifolius, p. 57. 



Leaves plane, not punctate. 



Flowers permanently yellow: inflorescence terminally 



cymose 16. ISOCOMA, p. 62. 



Flowers yellow changing to brown: inflorescence paniculate 

 17. HAZAKDIA, p. 64. 



Pappus-bristles (not over 40) rigid, some with distinctly flattened tips 

 8. ACAMPTOPAPPUS, p. 41. 



Flowers whitish: dioecious plants 26. BACCHAEIS, p. 95. 



Stems herbaceous throughout (annuals and low herbaceous perennials). 



Outer corollas enlarged, more deeply cleft on inner side 



18. LESSINGIA, p. 66. 



Outer corollas not enlarged, very slender and only one-half as long as 



style 25. CONYZA, p. 94, 



Outer corollas not enlarged, moderately or not at all exceeded by the 

 style. 



Involucral bracts scarcely imbricated, nearly equal 



24. EEIGEEON, p. 87. 



Involucral bracts regularly imbricated, unequal. 

 Flowers yellow, perfect. 



Bracts of the involucre all erect 



Chrysopsis Wrightii, p. 44. 



Outer bracts of the involucre with recurved tips 



Aster canescens, p. 85. 



Flowers whitish: dioecious perennials 26. BACCHARIS, p. 95. 



TRIBE 3. INULEAE. EVERLASTING TRIBE. 



Herbs, shrubs, or rarely trees, with mostly white-woolly or 

 glandular herbage. Leaves alternate (opposite in Psilocarphus), 

 entire, or more or less dentate in one species of Pluchea (even 

 laciniate in some non-Calif ornian species and genera). Heads 

 rather small and discoid in all our species, homogamous or heter- 

 ogamous, dioecious in some genera. Bracts of the involucre 

 commonly white or scarious. Anthers, with very few exceptions, 

 caudate at base, the tails free or united in pairs. Style-branches 

 of various forms but mostly obtuse or truncate, with marginal 

 stigmatic lines on the inner surface, not appendaged. Pappus, 

 in all of our species, capillary or none. 



