V. 



PLANT^ WRIGHTIAN^. 



113 



sometimes three-wlnged, but often only two-winged, the wings 

 wide as the body of the achenium. 

 broadly winged, sometimes with the ^ 



The disk 



sometimes half as 

 sometimes ahnost as 



the wings very narrow or obsolete, except at tlie 

 apex, where tliey project in an obcordate form : they are separated from the pappus 



by a narrow neck 



The 



vary greatly in length, and are occasionally 



than the firm, calvculate, lacerate crown with which their 



fluent, but they 



and the 



awns an 



K B. K 



•e commonly elongated 

 gs of the acheniuni ( 



at least one of them. 

 hich appear also in W 



for 



plant would evidently fall into Wedelia ; indeed, its whole 



that of Wedelia hispida, H. B. K. — This species and the preceding, with Lipochseta 

 strigosa, Z)C, so perfectly accord with the generic characters of Zexmenia of Llave 

 and Lexarza (doubtfully referred by De CandoUe to his Lipochseta) that I feel 

 obliged to restore that genus ; the more so, as they are apparently not congcneric 

 with the Sandwich Island species, for which in strictncss the name should be re- 

 tained, the oldest species being a Lipotriche of Lessing * Moreover, Lipoch?eta 

 umbellata, BC. which micht claim the generic name from its being the species 



& 



figured in Delesserfs Icones, is surely a congener of De Candolle's Lasianth 



withstanding 



smaller capi 



Again, th 



some species closely allied to 



Lasiantha^a helianthoides, but with a pauciserial involucre, which would also accord 

 with the character of Zexmenia. Since the genus which is to comprise these plants 

 must needs be remodelled and extended, it is best to revive at once the oldest 



name.l 



For these, however, Nuttall has established hls genus Microchoeta (which has priority over Mlcrochsete 



Hook.fd 



They are very closely related to Wollas- 



tonia, DC, and pcrhaps not to be separated from that genus. At least NuttalFs Microchseta procumbens 

 and M. strigulosa (Wollastonia procumbens and W. strigulosa) are genuine species of WoUastonia. 



t Zexmenia (Lasianth^a) helianthoides : foliis ovato-oblongis ovatisve basi nunc subcordatis brevi- 

 ter petiolatis subserratis reticulatis supra bullatis strigilloso-puberis subtus cauleque velutino-villosis ; capi- 

 tulis 5-7 in umbellam foliis fulcrantem congestis singulis breviter pedunculatis ; involucro 4-senali, 

 squamis omnibus ovatis appressis inappendiculatis ; ligulis aureis ; lobis corollae intus barbatis ; filamentis 

 villosulis ; paleis intermediis pappi conspicuis inter se et cum aristis (deorsura alis confluentibus) coalitis.— 

 Lasianthus helianthoides, Zucc. in lierh. Acad. Monac. Lasiantha^a helianthoides, DC. Prodr. 5. p. 608. 

 Mexlco, Karwi7iski ; and ncar Cuernavaca (Valladohd), &c., GJneshrechi (v. sp. in herb. Par. No. 

 379, 150). - Heads three quarters of an inch long, on stout peduncles ; involucre over half an inch m 

 diaraeter. Palete of the receptacle shortcr than the involucre, much shorter than the long and slender 



disk-corollas. i • i • 



Z. (Lasianth^a) Greggii (sp. nov.) : foliis ovato-lanceolatis acuminatis serrulatis reticulatis scabns 

 basi cordata sessilibus, floralibus parvulis ; capitulis 3 umbcllatim dispositis pedunculis dimidio terve brevi- 

 oribus ; involucro late campanulato triseriali, squamis omnibus ovatis inappend.culatis appress.s ; hgul.s 

 auriantiacls brevissimis; corolla; disci lobis puberis ; filamentis glabris; papp. pale.s .ntermedus conspicuis 



inter se et cum aristis basi iii alam ciliatam extensls coalitis. 



1, 



Betvveen the city of Mexico and Mazatlan 



^^. Heads half an inch in length and breadth ; the involucre much like that of the precedmg. 

 Rays, in the specimen, not longer than the disk-flowers. Pappus as in Z. hehantho.des _ 



Z. (Lasianth.^a) Ghiesbhechtii (sp. nov.) : foliis ovato-la.iceo1atis acuminatis serrulat.s ret.culat.s sub- 

 membranaceis hirtulo-scabris basi subco.-datis brevlter petiolatis ; pedunculis sohtarns tem.sve folns sum- 

 mls duplo capitulo pluries longioribus superne incrassatis ; involucro hemispha.nco tnser.ah,_sq..am.s .nap- 

 pendiculatis exterioJlbus rotunSo-ovatis appressis ; ligulis (ut vldetur aureis) disco paullo long.or.bus ; pappi 



'f 



