39 



350 ORDER LXVIII. — COMPOSITE. 



84. A chenia 4-sided ffelianthus, 50 



Achenia not 4-sided 85 



35. Achenia compressed • .• • • • <*6 



Achenia obcornpressed Coreopsis, 53 



86. Stem winged Actinomeris, 52 



Stem not winged Bidens, 54 



37. Leaves opposite 



Leaves alternate 



88. Pappus none Eclipta, 32 



Pappus 1-awn Zinnia, 42 



89. Receptacle naked *& 



Receptacle chaffy ** 



40. Pappus none Leucanthemum, 69 



Pappus present ** 



41. Pappus pilose or bristly ■ v ■ : •\-'-'^;" y :"" 42 



Pappus consisting of scales Palafoxia, m—Polypteris. 



42. Pappus double Diplopappus, 13 



Pappus simple 4< * 



43. Ravs sterile Galatella, 14 



Rays fertile 4 * 



44. Pappus of the ray and disk similar • • ••••:••: • ^ 



Pappus of the ray and disk dissimilar Boltonia, \3 



45. Achenia usually glabrous, compressed Aster, 16 



Achenia usually pubescent 



46. Achenia obconic, si ky Seri en carpus, 15 



Achenia pubescent, compressed Erigeron, ll 



47. Rays neutral *| 



Kays pistillate w 



48. Leaves undivided ,- • • • • • • ...Echinacea, 46 



Leaves divided Maruta,M-Anthemis. 



49. Pappus none Par ?TS a« 



Pappus none Achillea, 68 



50. Heads homogamous °,1 



Heads not homogamous os ' 



u 



51. Leaves alternate ^ 



Leaves opposite or verticillate 0i 



52. Receptacle, naked 54 



Receptacle chaffy • • • • • • • 



Receptacle bristly , Or*** SI 



53. Pappus setose Carphophorus, 7 



Pappus scaly Mrskalha, 66 



54. Pappus consisting of 4 or 5 scales Stnkesia, 2 



Pappus consisting of 12-20 scales Hymenopappwt, 61 



Pappus capillary or setose 



46 



55 



55. Scales of the involucre in a single series • <£> 



Scales of the involucre in more than one series 0* 



56. Heads white, brownish, or rose color Cticalia, 76 



Heads yellow • Senecio, il 



57. Heads paniculate Eupatorium, 11 



Heads in spikes or racemes < Muuris, & 



Heads more or less corymbose ° 3 



58. Corolla expanded at the base Kuhnia, 9 



Corolla expanded at the summit • • ••; • ; oy 



Corolla nearly straight Eupatonum,\\ 



59. Corolla palmately divided Elephantopus, 3 



Corolla not palmately divided ow 



60 Achenia oblonsc, with double pappus Yernonia, 1 



Achenia obconic, hairy lP^ovui, 22 



Achenia 10-striate Brickellia, 10 



U. Receptacle chaffy Melantliera, 41 



Receptacle naked 



63 



