64 COMPOSITE. 



conical or cylindraceous ; the chaffy bracts conduplicate around the disk-flowers. Lobes of 

 the disk-corolla mostly velvety-villoiis. Style-branches of disk-flowers with either truncate 

 or subulate tips. Akenes wingless or nearly so ; of the ray obconipressed-triquetrous, of 

 the disk much compressed. Pappus when present of erect awns or chaffy teeth. Leaves 

 mostly sessile and rays showy. 



85. SANVITALIA. Involucre short and broad, of dry or partly herbaceous bracts. Re- 

 ceptacle from flat to subulate-conical, at least in fruit ; its chaffy bracts concave or partly 

 conduplicate. Ligules (entire or 2-toothed at apex) often short and small. Disk-corollas 

 with glabrous lobes. Style-branches of disk-flowers truncate or capitellate at tip. Akenes 

 either all or the exterior thick-walled ; of the ray commonly 3-sided, and the angles produced 

 into as many thick and rigid divergent awns or horns ; those of the disk often heterogeneous, 

 from compressed-quadrangular to flat, some usually wing-margined, the pappus of one or 

 two slender awns or teeth or none. Leaves commonly petioled. 



* * Leaves commonly serrate, slender-petioled : akenes not compressed. 



86. HELIOPSIS. Involucre short, of nearly equal oblong or lanceolate bracts, the outer 

 herbaceous. Eeceptacle from high-convex to conical; the pointless chaffy bracts partly 

 embracing the disk-flowers. Ligules large, oblong or narrower : disk-corollas glabrous. 

 Style-branches tipped with a very short conical hirsute appendage. Akenes short aud thick, 

 obtusely 4-angular, or in the ray somewhat' triangular, with broad truncate summit, wholly 

 destitute of pappus, or sometimes with the annular border 1-4-dentate. 



99. BALSAMOBRHIZA § Kalliactis also has persistent ligules ! 



Subtribe V. Veebesine.b. Eay-flowers ligulate and either fertile or neutral, or not 

 rarely wanting, the ligule not becoming papery and persistent on the fruit (with one 

 exception), but sometimes marcescent : disk-flowers hermaphrodite and fertile (or 

 some of the inner often failing to produce fruit), subtended and sometimes enwrapped 

 by the bracts of the receptacle. Anthers often blackish. Akenes various but those 

 of the disk never obcompressed : pappus cupulate or coroniform, or of teeth or awns 

 from the 2 to 4 princijial angles, or of some squamellse, or of a few stout (bitt not 

 capillary) bristles, or none. Leaves either opposite or alternate. 

 * Involucre 4- rarely 5-lobed and foliaceons, valvate and saliently 4-5-angled in the bud : 



akenes short and thick : pappus when present pluripaleaceous in the manner of 



Hdenioidcii;. 



87. TETRAGONOTHEOA. Heads many-flowered ; ray-flowers few or several, fertile. 

 Principal involucre membranaceo-foliaceous, spreading in anthesis ; the 4 or 5 broadly ovate 

 bracts connate at base; within are 6 to 15 small chaffy bracts subtending ray-flowers, and 

 similar to the thin-membranaceous and nervose lanceolate chaffy bracts of the at length coni- 

 cal receptacle. Ligules with short tube or almost nearly sessile, 5-8-nerved : disk-corollas 

 with elongated cylindraceous throat, 5-lobed. Style-branches of the disk-flowers hispid 

 above, and tipped with a rather long acute or acuminate appendage. Akenes more or le.'^s 

 4-sided, with a broad flat summit, destitute of pappus, or with a crown of numerous chaffy 

 squamellse. Leaves opposite. 



# * Involucre of several or numerous distinct bracts. 

 -I— Bracts of the receptacle permanently investing the akenes as an indurated accessory 

 covering. 



88. SCLEROCARPUS. Heads many-flowered; the ray-flowers several, neutral. In- 

 volucre of rather few more or less herbaceous bracts, the outer loose and spreading. 

 Receptacle convex or conical; its at length coriaceous or cartilaginous bracts closely invest- 

 ing the akenes and falling away with them by an articulation. Disk-corollas 4-5-cleft: 

 style-branches mostly with subulate appendages. Akenes smooth, oblong or oboAoid ; pappus 

 a short crown or ring, or none. Branching herbs. 



-i- •)- Bracts of the receptacle mostly reduced to awn-shaped chaff or bristles subtending 

 the naked akenes. 



89. ECLIPTA. Heads many-flowered : ray-flowers numerous, small and short, fertile. In- 

 volucre broad, of one or two series of herbaceous bracts. Receptacle uearly flat. Disk- 

 corollas 4-toothed, rarely 5-toothed ; their style-branches with short obtuse or triangular tips. 



