LXX. COMPOSITiE. IGl 



Rays wliitc ; disk yellow 19. Erioeeon. 



Ray yellow, as well as ilic disk . . . .20. Nidorella. 

 Marginal flowers fdiform, in 1 row. Leaves 



heath-like 25. Leptothamnus. 



Marginal flowers filiform, in many I'ows. 

 Leaves more or less broad. 



Anthers witliout tails 26. Conyza. 



Anthers tailed at the base 32. Blumea. 



Pappus 0, or of very minute, flat scales. 

 Receptacles flat. Disk-flowers 5-toothed, 



sterile 31. Denekia. 



Receptacles conical. Disk-flowers 4-toothed 27. DicnEOCEPHALA. 



4. Heads dicecious, discoid ; male and female 



flowers in separate heads, on distinct roots. 

 (Balsamic shrubs or trees.) 



Aclienes woolly, without pappus 30. Tarciionanthus. 



Achenes pubescent, with copious, bristle- 

 shaped pappus 29. Brachyl^na. 



5. Heads monogamous, discoid ; all the flowers 



tubular and perfect. 

 Receptacles covered with rigid scales {palece) . 12. Amelltjs. 

 Receptacles nude. 



Anthers not tailed at base. 



Pappus bristle-shaped, uniform. 



Pappus 1 -seriate, very slender, deci- 

 duous 23. Chrysocoma. 



Pappus in many rows, rigid, persistent 24. Pteronia. 

 Pappus double ; outer of short, narrow 



scales ; inner of long, rough bristles . 22. Fresenia. 

 Anthers tailed at base ; pappus copious, of 



many bristles, or of scales and bristles . 35. PegOLETTIA. 



6. Heads compound, i. e. many small, discoid heads 



united on a common receptacle, with a general 



involucre. Pappus 28. Spii^ranthus. 



Tribe 4. Senecionide.e. (Gen. 39-124.) 



Subtribe 1. Helianthe^. Leaves opposite, broad, mostly petioled. 

 Receptacles bearing palea? among the disk-flowers. Anthers without tails, 

 short, dark-coloured. Pappus of a few stilf, persistent awns or 0. (Gen. 

 39-44.) 



Achenes bcaklcss, without pappus. 



Receptacles flat. Involucral scales 2-seriate, 



ovate, acute 39. Eclipta. 



Receptacles flattish. Involucre double ; outer of 



5, spathulate, spreading, glandular leafy scales 40. Siegesbeceia. 

 Receptacles conical. Involucral scales sliort, 



appressed 44. Spilanthes. 



Achenes beaked, bearing 2-5, rigid, retrorsely his- 

 pid bristles 42. Bidens. 



Achenes beakless, with pappus. 



Pappus cup-shaped, toothed 41. Wedelia. 



Pappus of 8-10, rigid, unequal, rough bristles . 43. LiPOTRiCHE. 



Subtribe 2. Helenie/E. Leaves (except in Oederd) alternate. Recep- 

 tacles nude or bearing palece. Anthers without tails. Pappus of several 



M 



