360 COMPOSITE. 



Heads solitary ; 



Peduncles scape-like, --..--. 10, 11 

 Branched shrubs, --------- 11, 12 



Heads panicled or thyrsoid-congested ; style-branches long, 



slender, 12, 13 



Style-branches shorter ; 



Corolla ventricose, -------- 15 



Corolla tubular, ---------14 



Heads small, in a flat-topped cluster, -------16 



Heads small, in a panicled or thyrsif orm terminal inflorescence, 17 



Rays palmatifid, ---------- 19 



* * Ray-corollas when present not yellow, except in n. 18. 

 ■i— Pappus not excessively copious or accrescent. 



Pappus of 3—5 awns or bristles, -.---.--.- ^ 



Pappus ; herb acaulescent, -.------.----27 



Pappus of many reddish or tawny bristles; 



Ray-corollas palmatfiid, ---------- 19 



Ray-corollas ligulate ; 



Style-tips very bristly, ------- 20 



Style- tips not bristly ; 



Suffrutescent, ------- 18 



Acaulescent herbs, -------26 



Branching herbs, - - - - - 21 



Pappus of white, or merely yellowish or brownish bristles; 

 Corollas all permanently white, or at least pale; 



Rays many, very small, scarcely spreading; heads small, panicled or 



racemose, ----..---.-- 26 



Rays few, broader, spreading ; heads cymose-corymbose, - 22, 24 



Disk-corollas yellow, changing to red, brown or purple ; 

 Rays 15—40, broad-linear ; involucre imbricated ; 



Stems simple ; head solitary, --------- 25 



Stems branching ; heads many, ---------23 



Rays 50—100 or more, very narrow ; involucre scarcely imbricate, - - 28, 29 



-1— -i— Pappus copious, accrescent. 



Annual herbs ; rays minute, ------------go 



Perennial or shrubby ; rays none, ---------- 3^ 



4. GUTIERREZIA, La Gasca. Nearly glabrous, somewhat resiuif- 

 erous freely braucbing herbaceous or suffrutescent plants. Leaves alter- 

 nate, narrow, entire. Heads small, spherical, hemispherical, or narrower, 

 usually corymbosely arranged at summit of stem and branches. Invol- 



