296 COMPOSITE. 



* styles with long and slender branches. 



85. Dysodia. Head mostly with rays. Papj^s single, of rigid chaffy scales dissected into 



many bristles. i i • 



86. NicoUetia. Head with rays. Tappus double ; the outer of capillary bristles, the inner of 



5 chaffy awn-jjointed scales. 



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



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



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



fringed near the base with slender bristles. 



Tkibe VII. ANTHEMIDEiE. Heads heterogamous either with ligulate ray-corollas or ray- 

 less, the pistillate flowers bemg small and tubular or none, or homogamous, all the flowers 

 perfect with regular tubular corollas. Receptacle naked, or in some with narrow cliaff sub- 

 tending the flowers. Anthers without tails. Branches of the style in the perfect flowers 

 with truncate or tnmcate-capitate tips, or in hermaphrodite-sterile flowers undivided. 

 Akenes small, destitute of pappus or with a short scarious 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 chaffy, at least among the central flowers : heads in our species with rays. 



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



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



* Receptacle not chaffy. 



■i- All the flowers furnished with corolla. 



9 L Chrysanthemum. Rays numerous and conspicuous. Receptacle flat or convex. Akenes 



SL'ViMul- ribbed or angled. 

 92. Matricaria. Kays in our species wanting ; the flowers all alike and perfect. Receptacle 



high-conical. Akenes angled, truncate at top. 

 93 Tanacetmn. Rays none, but sometimes the marginal pistillate with enlarged and oblique 

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

 form pappus. 



94. Artemisia. Rays none. Corollas in the marginal pistillate flowers (when there are any) 



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

 mostly obovoid and rounded at the top, with a small terminal areola and no pappus. 

 +- -h Pistillate flowers apetalous, merely naked pistils : akenes obcompressed. 



95. Cotula. Heads peduncled. Akenes not pointed with persistent style, those of pistillate 



flowers stalked. 



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



Tribe VIII. SENECIONIDE^. Heads heterogamous with ligulate (rarely filiform) ray- 

 corollas, or sometimes homogamous and discoid ; the flowers perfect, or rarely staminate, 

 and with regular tubular corollas. Receptacle not chafiy. Anthers often sagittate at base, 

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

 what capitate, or obtuse tips, rarely with any distinct appendage. Pappus of numerous 

 usually very fine 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. TUSSILAGINEiE. Heads monoecious, the tubular disk-flowers staminate (in 

 Tussilago), or dioecious : style in the tubular sterile flowers undivided or nearly so. 

 97. Petasites. Heads dicecious and heterogamous : flowers white or purplish ; the fertile ones 

 pistillate and more or less conspicuously radiate. 

 Subtribe II. EUSENECIONE^. 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 



Ion" linear or linear-lanceolate recurved lobes. Scales of the involucre dry, rather ngid. 



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



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



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

 proppr tube, long and narrow limb, and 5 short and obtuse glandular or villous teeth. 

 Pappus brownish and rather rigid, very unecpial. 



