350 ORDER LXVni. COMPOSITE. 



84. Achenia 4-sided Hdianthus, 50 



Achenia not 4-sided 85 



85. Achenia compressed 36 



Achenia obcomprcssed Coreopsis, 53 



36. Stem winded Actinomeris, 52 



>t. -m not winged Bidens, 54 



37. Leaves opposite 3S 



Leaves alternate 39 



88. Pappus none Eclipta, 32 



Pappus 1 -awn Zinnia, 42 



39. Ite^eptacle naked 40 



Receptacle chaffy 47 



40. Pappus none Leucanthemum, 69 



Pappus present 41 



41. Pappus pilose or bristly 42 



Pappus consisting of scales Pala/oxia, 60— Polypteris. 



42. Pappus double Diplopappus, 18 



Pappus simple 43 



43. Bays sterile Galatella, 14 



Pays fertile 44 



44. Pappus of the ray and disk similar 45 



Pappus of the ray and disk dissimilar Boltonia, 19 



45. Achenia usually glabrous, compressed After, 16 



Achenia usually pubescent 46 



46. Achenia obconic. si ky Sericocarpus. 15 



Achenia pubescent, compressed Erigeron, 17 



47. Rays neutral 48 



Bay* pistillate ' 49 



4>. Leaves undivided Echinacea, 46 



Leaves divided Maruta, 67 — Anthem is. 



49. Pappus consisting of 2 scales Parthevium, 37 



Pappus none Achillea, 68 



50. Heads homogamous 51 



Heads not homogamous 69 



51. Leaves alternate 52 



Leaves opposite or verticillate 61 



52. Eeceptacle naked 54 



Receptacle chaffy 53 



Eeceptacle bristly L'irsium, bl 



53. Pappus setose Carphi>phorxi8, 7 



Pappus scaly Marshallia, 66 



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



Pappus consisting of 12— 20 scales Hymenopappus, 61 



Pappus capillary or setose 55 



55. Scales of the involucre in a single series 56 



Scales of the involucre in more than one series 57 



50. Heads white, brownish, or rose color Cacalia, 76 



Heads yellow Senecio, 11 



57. Heads paniculate Eupatoi ium, 11 



Heads In spikes or racemes Liat 



Heads more or less corymbose 53 



5-i. Corolla expanded at the baas Kuhnia, 9 



Corolla expanded at the summit 59 



I nearly straight Eupatoriion, 11 



60. Corolla palmately divided Elephantopus, 3 



Corolla not palmately divided 60 



60. Achenia oblong, with double pappus Vemonia, 1 



Achenia obconic, hairy Biglovia, 22 



Achenia l0-*triate Brickellia, 10 



8L K' » ptaole chaffy Jftlanthera, 41 



Receptacle caked 63 



