ORDER LXVIII. COMPOSIT.C 851 



69. Pappns coroniform Codestina, 4 



Papiius not coroniform C3 



6". Pappus consisting of scales C4 



Papj >-as capillary or setose C5 



6-1. Flowers blue or white Agerdtum, 5 



Flowers purple Sclerolepis — Spurganopfborus, 6 



65. Aohenia striate or ribbed <>•'> 



Achenia angled 67 



66. Pappus plumose Kuhn ia, 9 



Pappus scabrous Brickellia, 10 



67. Receptacle conic ConocUnium, 13 



Receptacle flat 63 



68. Scales of the involucre numerous Eupaiorium, 11 



Scales of the involucre few Mikania, 12 



C9. Heads monoecious, fertile flowers petalous Conyzn, 27 



Heads monreoious, fertile flowers apetalous Soliva—GymnoatyLU, 72 



Heads heterugainous 70 



Heads liet. rocephalous 75 



Heals dioecious 76 



70. Receptacle cliafiFy /»<-/, 38 



Receptacle hir ute Pterocaulon, 3'J 



Rectptacle setose or naked 71 



71 . Receptacle setose 72 



Receptacle naked 73 



72. Flowers purple Ceniaiiren, 79 



Flowers yellow Cnicus, 80 



73. Flowers ye low, with divided leaves Artemisia, 71 



Flowers purple Fluchea, 29 



Flowers white 74 



74. Scales of the involucre in one series Erechtites, 75 



Scales of the involucre imbricate Gnaphalium, 73 



75. Fertile heads 1-flowered Ambrosia, 39 



Fertile heads 2-flowered Xanthium, 40 



70, Shrubs Baccharis, 28 



Herbs Antennaria, 74 



77. Pappus none Apogon, 83 



Pappus present 78 



78. Pappus capillary 80 



Pappus not capillary 79 



79. Pappus few scales and bristles Krigia, 84 



Pappus numerous scales and bristles Crjiithia, So 



80. Achenia beaked 84 



Acheti ia not beaked 81 



81. Flower.'? yellow S3 



Flowers not yellow 82 



82. Flowers usually nodding Xabalus—Prenanihes, 87 



Flowers erect Lygodesmia, 88 



83. Achenia flattened Soncfintt, 98 



Aclienia not flattened I/ieraciinn, 86 



64. Flowers bine Mulgedium, 92 



Flowers not blue S5 



85. Heads paniculate, nimierous Lactuca, 91 



Heads solitary or very few S6 



86. Heads on a fistulous, naked scape Tararicum, S9 



Stem simple J'yrrhopappun, 90 



