LeiGHtA differs from the preceding sections or subgenera 

 by a one-ranked pappus of several permanent radii or 

 pieces, of which two are large, opposite, filiform and 3-<»r- 

 nered, the rest small and paleaceous (chaffy) ; as well as 

 by a calyx higher than the disk of the corolla and com- 

 posed of regularly imbricated close-pressed leaflets, each 

 of which is surmounted by a large recurvedly spreading 

 appendage resembling the leaves of the plant. There are 

 three published species that belong here : 1 . elegans, the 

 HsuANTHUS linearis (vol. 7. fol. 523.) of this Register, of 

 the synonymy of which M. Gassini seems to have had only 

 »n uncertain knowledge: 2. Ucolary the Helianthvs angns- 

 HfoUus of Linnaeus : 3. fmcrophytta, the Helianthus micro- 

 phallus of Knnth. (f^id.Tiov. gen, et spec. 4.2^, t. 375.). 



The genus Viguiera of Kunth is said by M. Cassini to 

 differ from his Harpalium and Leighia only by its one- 

 ranked calyx and elevated conical receptacle. He suspects 

 moreover that Helianthus parvifiorus of Kunth, with a ca- 

 lyx very near to that of Viguiera, but a pappus and recep- 

 tacle of the true Helianthus, may form a fourth subgenus; 

 for which however he proposes no name. 



TiTBoNiA tagetijkra, vol. 8. fol. 591. of this work, be- 

 longs to the fii-st section of the Helianthece of M. Cassini, 

 entitled Heliantheas-heteniece ; as does also Helenium qua- 

 dndentatum of the same volume, fol. 598. 



Heliopsis canescens (see above in vol. 8. fol. 592.) be- 

 longs to the fourth section of the Helianthece of the same 

 author, entitled HeUanthece-rudbecldece. 



