294 COMPOSIT.E. 



♦ * » Ray-akenea obcompresscd or clavate, completely enclosed in the involucial scales, which 

 are at base llattisli on the back with their thin margins abruptly infolded. 



58. Lagophylla. Head t'ew-tiowered : ray-akcnes about 5, obovate, much ubcompiesbcd, smooth. 

 Disk-lluweis inlcrtile : pappus none. 



50. Layia, Head muny-tlowoiod ; ruy.i 8 to 20, with obovato or somewhat cliivnto smitotli 

 akcnu.s. Disk-lhiwers or most ol' them fertile, their siniihir or narrower akeiiea often 

 pubescent : pajipus composed of bristles (,citiicr plumose below or naked) or of subu- 

 late-pointed scales, or sometimes none. 



60. Achyrachaeua. Head many-liowered ; the tlowers all fertile. Akenes linear-cuneate or 



clavate, 10-ribbed, some or all tlie ribs tuberculate-scabrous ; those of the disk with a 

 paj)pus of blunt silvery-scarious chatfy scales in two series, tiie inner as long as the 

 corolla. 



TuiBE VI. HELEN IDIDE.E. Heads hetorogamous witli ligulato ray-corollaa, or discoid 

 and homogamous by llie absence of mys : the tubular disk-llowers perfect and fertile or 

 rarely sterile. Receptacle never chatfy (in one or two cases with awn-like bodies resem- 

 bling clialf). Anthers without tails. Ihanches of the style in perfect flowers either trun- 

 cate or tipped with an ap[)endago. Pappus of seveial clialfy scidi's or sometimes of awns 

 or rigid bristles, not rarely wanting. Leaves opposite, or all but the lowest alternate. 

 Involucre of herbaceous or membranaceous scales, in one or two or rarely 3 or 4 series. 

 Corollas most commonly yellow, both in disk and ray. 



Subtribe I. JAUMIE/E. Involucre of broad scales regularly imbricated, the outer succes- 

 sively shorter, destitute (as also the herbage) of oil-glands. Akenes narrow, angled, in ours 

 destitute of pappus. Rays deciduous from the akenes. 



61. Jaiunea. Involucre campanulato. Leaves opposite, connate at base, narrow, fleshy. 



62. Venegasia. Involucre very broad. Leaves alternate, ovate or cordate, membranaceous, 



long-petioled. 



Subtribe II. KIDDELLIEiE. Involucre of narrow equal scales. Rays persistent on the 

 akenes, becoming papery. No oil-glands. Plants more or less white-woolly. 



• Pappus of chalTy scales : rays very broad and few. 



63. HlddelUa. Head scvoral-llowered ; tlie 8 or 4 rays broader than long, fow-nerved, raised on 



a short slender tube, 3-lobwl. Leaves alternate. 



♦ ♦ Pappus none : rays 5 to 60. 



64. Baileya. Rays destitute of a tube, 7-nerved. Akenes many-striatc, all fertile. Receptacle 



nearly flat. I^eaves opposite. 



65. "Whitneya. Rays with a snort tube, 10- 16-nerved. Akenes few-nerved, those of the disk 



sterile. Receptacle conical. Leaves opposite. 



Subtribe IIL HELENIE^E. (Boeriece dk Eaheleiiiece, Benth.) Involucre of nearly equal 

 or narrow scales in one or few series. Rays if any deciduou.s. No oil-glands. 



» Akenes linear or linear-cuneate, 4-angled or compressed, but not with cartilaginous margins. 



+■ Receptacle conical, convex, or in part of No. 67 & 68 flatfish or flat : involucre of few or seveml 

 erect appressed or united herbaceous scales. 



++ Rays few, very short and included : receptacle high-conical : leaves all opposite, entire. 

 71. Lasthenia in part. Involucre a many-toothed cup. 



66. Burrielia. Involucre of 3 to 5 separate flat scales. Receptacle subulate or almost filiform. 



Akenes slender : pappus of 1 to 4 rigid awn-.shaped scales. 

 +t ++ Rays exserted and spreading. 



67. B^ria. Receptacle high-conical and mostly acute, minutely muricate. Scales of the invo- 



lucre separate, lint, in a single series. Akenes linear or lincar-cuneato. Leaves all 

 opposite, entire or lacininto-pinnatilid. 



68. Actinolepis. Receptacle convex or conical, or rarely almost flat. Scales of the involucre 



wholly separate, becoming concave and involute around the ray-akenes. Antliers 

 tipped with a narrowish or very slender appendage. Akenes slender. Leaves opposite 

 or alternate. 



69. Bahia. Heceptaclo flat, convex, or obtusely conical. Scales of the involucre separate or 



partly united into a cup, not embracing any of the akenes. Rays entire or barely 

 toothed at apex. Akenes linear or oblong-linear, with large terminal areola : pappus 

 of blunt nerveless scales, rarely wanting. Leaves opposite or mostly alternate, com- 

 monly lobcd or divided. Ours all woolly plants. 



