3gO COMPOSITAE GAILLARDIA 



with short narrow tube, enlarged cylindraceous throat and 5 oVate- 

 triangular to subulate teeth or lobes which are beset with jointed 

 hairs. Style-branches with a penicillate tuft at the summit of 

 the stigmatic portion, thence produced into a filiform or shorter 

 appendage. Receptacle convex to globose, beset with setiform or 

 subulate or rarely small dentiform fimbrillse among the flowers. 

 Achenes turbinate, 6-costate, covered with long villous hairs 

 which usually rise only from its base. Pappus conspicuous, longer 

 than the achene, of 5-10 hyaline-scarious scales, with a costa 

 mostly excurrent into an awn. 



G. aristata Pursh Fl. ii, 573. Pubescent with j ointed hairs : stems 1-3 

 feet high, few to many from the crown of a thick perennial root : leaves of 

 firm texture, lanceolate or broader, or the lower spatulate, from entire to 

 laciniate dentate or sinuate-pinnatifid mostly obtuse, 2-5 inches long: 

 bracts of the involucre lanceolate or narrower, callous at base, more or 

 less hirsute ; rays all yellow, in the larger heads 18 lines long, neutral ; 

 disk-corollas brown, the subulate acute lobes tipped with a seta or cusp, 

 externally beset with long hairs ; scales of the pappus slender-awned : fim- 

 brillae of the receptacle setiform, surpassing the villous achenes. Stream- 

 banks and plains, Brit. Columbia to California and Minnesota. 



Tribe vi. ANTHEMIDEAE Cass. Opusc. Hi, 161. Heads 

 homogamous with the flowers all tubular and hermaphrodite or 

 more commonly heterogamous with the pistillate flowers ligulate 

 and radiate or sometimes with corolla reduced to a tube, or obso- 

 lete. Receptacle either^ naked or ivith some chaffy bracts. Bracts 

 of the involucre imbricated, zvholly or partly dry and scarious or 

 scale-like, not foliaceous, seldom herbaceous. Anthers without 

 tails at base. Style-branches of the hermaphrodite, flowers trun- 

 cate, and sometimes zvith obscure conical tips. Achenes usually 

 small and short, with no pappus, or a paleaceous crown, or a circle 

 of squamellae. 



* Receptacle with chaflfy bracts subtending some or all of the disk- 

 flowers : heads radiate or the rays wanting in certain species : involucre 

 of comparatively small imbricated bracts, the outer successively shorter : 

 receptacle convex to oblong: style-branches truncate-penicillate. 



70 Anthemis Involucre broad : rays large : achenes 4-5-angled or 8-10- 



ribbed. 



71 Achillea Involucre narrow: rays small: achenes obcompressed. 



* * Receptacle without chaff or bracts among the flowers. 

 ■^ Heads comparatively large, radiate, or rarely discoid, pedunculate 

 and solitary at the summit of the branches. 



72 Matricaria Flowers in our species all alike and perfect: receptacle 



high-conical: achenes angled, truncate at the apex. 



73 Chrysanthemum Rays numerous and conspicuous : receptacle flat or 



convex: achenes several-ribbed or angled. 

 *' "^ Heads sessile, discoid, heterogamous; pistillate flowers most 

 numerous, apetalous, their achenes pointed with an indurated persistent 

 style. 



74 SoLivA Rays none : receptacle flat : achenes obcompressed,- with rigid 



wings or callous margins, sessile. 



