296 COM POSIT J-;. 



♦ Styles with long and sleiuler branches. 



85. Dysodia. Head mostly with rays. Pappus single, of rigid cliafly scales dissected into 



many biistles. 



86. NicoUetia. Head with rays. Pai)[)U3 double ; the outer of capillary bristles, tlie inner of 



5 thally awn-pointed scales. 



87. Porophyllum. Head rayless. Pappus single, of copious rough capillary bristles. 



» * Styles long, thickish upward, and with very short blunt branches. 



88. Pectia. Head with rays. Pappus of awns or bristles. Leaves opposite, undivided, mostly 



fringed near the base with slender bristles. 



Tkibk VII. ANTHEMIDE/E. Heads heterogamous either with ligulate niy-corollas or niy- 

 lesa, tlio j)istillalu llnwers being sundl and tubular or uono, or houiogamoua, all the llowers 

 lK)rlei!t Willi regular tubular corollas, liecoplaclo nuked, or in Honio with narrow clialf sub- 

 tending the llowers. Anthers without tails, Hranchos of the style in the perfect llowers 

 with truncate or triincate-capitalo tiiis, or in heruiaphrodito-alorilo llowers undivided. 

 Akenes small, destitute of pappus or with a short scanous crown or ring. Leaves alter- 

 nate, commonly dissected. Involucre of dry or partly scarious scales, appressed and imbri- 

 cated in two or more (rarely almost in a single) series. Herbage mostly strong-scented. 



♦ Receptacle chalfy, at least among the central flowers : heads in our species with rays. 



89. Achillea. Involucre narrow : rays short. Akenes obeompressed, margined. 



90. Antheiuis. Involucre broad : rays conspicuous. Akenes 4 -5-angled or 8 - 10-ribbed. 



* Peceptacle not chafly. 

 +• All the llowers furnished with corolla. 

 9L Chrysanthemum. Hays numerous and conspicuous. Ueceptucle Hat or convex. Akenes 

 several-ribbed or angled. 



92. Matricaria. Kays in our species wanting ; the flowers all alike and perfect. Hei'eptaele 



high-conical. Akenes angled, truncate at top. 



93. Tanacetum. Kays none, but sometimes the marginal pistillate with enlarged and oblique 



corollas. Heads corymbose. Akenes broad at the top, more commonly with a coroni- 

 I'orni pappus. 

 9i. Artemisia. Rays none. Corollas in the marginal pistillate flowera (when there are any) 

 slender and 2- 3-toothed. Heads panicled or racemose, small, often nodding. Akene.s 

 mostly obovoid and rounded at the top, with u snndl terminal areola and iro pappus. 



-H +■ Pistilhito llowcis upelalous, merely naked pistils : ukencs obeompressed. 

 Df). Cotiila. Heads pediinclcd. Akenes not pointed with perslHlenl Htylo, those of j)islilluto 



llowers stalked. 

 96. Soliva. Heads sessile. Akenes pointed with a long and indurated style, sessile. 



Tribe VIII. SENECIONIDE^E. Heads heteroo;amous with ligulate -(rarely filiform) ray- 

 corollas, or sometimes homogamous and discoid ; the llowers perfect, or rarely stnminote, 

 and with regular tubular corollas. Ueceptado not chally. Anthers often sagittate at base, 

 but without tails. Branches of the style in perfect llowers mostly with truncate, or .some- 

 what capitate, or obtuse tips, rarely with any distinct appendage. Pai)pus of numerous 

 usually very line and soft capillary bristles. Leaves mostly alternate. Involucre almost 

 always of equal herbaceous scales, in one or two series, or with some short ones or bracts 

 added. Flowers usually yellow. 



Subtribe I. TQSSILAGINEiE. Heads moncecious, the tubular disk-llowers staminate (in 

 Tussilagu), or dioecious : style in the tubular sterile llowers undivided or nearly so. 



97. Peteisites. Heads dioecious and heterogamous : flowers white or purplish ; the fertile ones 



pistillate and more or less conspicuously radiate. 



Subtribe II. EUSENECIONEiE. Heads heterogamous or homogamous : the tubular disk- 

 flowers perfect and fertile, with 2-cleft style. 



♦ Leaves all alternate : bristles of the pappus barely scabrous or denticulate. 



98. Tetradymia. Heads homogamous, 4 -18- flowered. Limb of the corolla 5-parted into 



long linear or linear-lanceolate recurved lobes. Scales of the involucre dry, rather rigid. 



99. Luina. Heads homogamous, about 10-llowered. Corollas with slender tube, long and nar- 



row limb, and 5 short ovate-lanceolate lobes. Style-branches obtuse. Pappus soft and 

 white. 

 100. Psathyrotes. Heads homogamous, rather many-flowered. Corollas with very short 

 proper tube, long and narrow limb, and 6 short and obtiise glandular or villous teeth. 

 Pappus brownish and rather rigid, very unequal. 



