COMPOSITAE (composite FAMILY) 



47«i 



AwBs not retrorsely bacbed or hispid, often at length 



deciduous. 



''Ray-flowers fertile; achenes winged . . . 6S. Ximenesia. 

 Ray-flowers neutral. 



Involucral bracts distinct, -'somewhat foliaceous 54. Helianthella. 



Involucral bracts all more or less united at base 66. Coreopsis. 

 Awns retrorsely barbed or hispid. , _ ■ > ' 



Involucral bracts united only at base . , . S7. Bidens. 

 Inv^qlucral bracts united into a cup .68. Thelespeima. 

 Involj^cfal bittct^ pa^ly or wholly inclosing the ray achenes. 



RdsM I'-S, IhconspSjcuous, yellow ..... 69. Madia. 



Ray^ 8^12, conspicuous, white or rose 60. Layia. 



Tribe VI. HELENIEAE 



Herbage without' oil'-'glands; not rank-scented but of ten aromatic. 

 Ligiues 'persi^ent^'and' 'becoming papery; plants more or less 



woolly : 61. PsUostrophe. 



Ligules deciduous or wanting. 

 Aiohenes flat^ with only marginal nerves . . j. . .62. Pericome. 

 Achenes angled (not flat), nerved or striate. 



Receptacle not chaffy. 

 rfi'.A't'least the tips of the involucral bracts petaloid or scar- 

 ious. 



H«ul8 rityless ,63. Hymenopappus. 



' ^' ^ '-Heads radiate. 



Ligules white or yellowish ' 64. Leucampyz. 



Ligules purple' • , • •. ' • ■ ■ ■ ^^- Polypteris. 



Involucral bracts not petaloid or scarious. 

 Achenes 4-angled. 



' Leav^^all entire 67. Platyschkuhria. 



;; '■■Leav^iiotallentire. 



Bracts of the involucre in 2 series, more or less 



' iihited .. 66. EriophyUun. 



Braicts of the involucre distinct. 

 Plants not glutinous or viscid. 



1 . -^-^owers yellow . 68. Bahia. ', 



■'■-' - - ■ i T V'Eiowers white orflesh-color . . - . . 69. Chaenactis. 

 Plants glutinous or viscid .... 70. Hulsea. 



Achenes 5-10-ribbed; herbage commonly impressed- 

 punctate and resiniferous. . , - , 

 Pappus present; -*"^ - ;-' t ' ■- m - ,. 



Involucral bracts erect. 

 Leaves entire, <>u^iial]j^ linear . , . . ^ . . 71. Actinella. 

 Leaves not entire. 

 ■ I . . Herbage glabrous or becoming glabrate . 72. Hymenozys. 



Low woolly .alpine perennial, with 'enormous 



heads . . ' . ' . . . 73. 'Rydbergia. 



Involucral bractSsspreading-orreSexed. ii - 

 Leaves not decurrent on the stem, usually some 



of them parted . , ,. . 74.^D.waldea. 



Leaves decurrent on the stem, entire: ■ . . 76. HeteDiiim. 

 Pappus wanting . . . . ., . . 76- Flaveria. 

 .- Receptacle with bristle-like chaff , , - ,. . . 77. Gaillardia. 

 Herbage with oil-glands, heavy- or rank scented. 



Leaves pinnately divided -,--< I - ,■ . 78. -Dysodi^ ,: 



Leaves entire, narrow . < , . 79. Pectis. 



Tribe Vn. AHTHEMIDEAE 



Receptacle clbaffy,. at least i)i pktt. 



Heads broad; rays cpn^iciipiis 80. AnthenUs. 



Heads narrow; rays shprt ' . ," . , . . . 81. Achillea. 

 Receptacle naked.' - , " '[\ 



IJea^s soliisjry or corymbose, 

 "'Recep'tattle conical, ait least in age , . , • , ' . 82. Matricaria. 



, Receptacle flattish or only taoderately convex. ■ 



Heads radiate , . , ' . . . . . , . '. 83. Chrysanthemum 

 - Heads rayless . ,! . . ., . . . . 84. Tanacetum. 



Heads several, to many, spicate or raicempse^aniculate, discoid 85. Artemisia. 



Tribe Vra. SENECIONEAE 



Flowers white or purple; rays wanting , . , , . 86. Petasites. 



Flowers yellow. _ 

 Leaves opposite. 



Involucral bracts spreading 87. Haploesthes. 



Involucral bracts erect or connivent . • . . . 88. Arnica. 

 Leaves alternate. 

 Shrubs; heads rayless, 4-9-flowered . ; . . . 89. Tetradymia. 

 Herbs; rays (Usually present, flowers many .... 90. Senecio, 



