OF ARTS AND SCIENCES. 35 



Lindheimera calls for some modification of the generic character. 

 Its affinity with this genus is shown in the peculiar porrcct internal 

 tooth or process which surmounts the carina or costa of the inner 

 face of the akene (a character which is omitted from Bentham and 

 Hooker's Genera Plantarum). The peculiar scarious wing appears to 

 be that of Schizoptera (which is said to have a slender tube to the 

 ligules and a different habit). The habit of this plant is that of 

 Chrijsognnum Virginianum, but with the lyrate leaves of Berlandiera 

 lyrata. It accords with Silphium in that neither the adjacent paleaj 

 (which are very slender) nor the subtending involucral bract adhere 

 to and fall away with the achenium. The root is perhaps perennial. 



Piiilactis longipes. Scabrido-pubescens ; foliis brevissime pe- 

 tiolatis ovatis parce inrequaliter dentatis, summis lanceolatis; capitulo 

 in pedunculo terminali longissimo solitario ; receptaculo mox columnari 

 ligulas oblongas (semipollicares) longius superante ; acheniis (im- 

 maturis) omnibus complanatis glaberrimis (faciebus nee costatis nee 

 angulatis), radii obcompressis marginibus acutis apicc emarginatis 

 vel retusis calvis, disci parum angustioribus crassioribus nunc calvis 

 nunc dentibus obtusis parvis 2 (ex marginibus) vel 4 (accessoriis 

 minimis alternantibus ) instructis. — In valleys along the foot-hills of 

 the mountains near San Luis Potosi, July. No. 465. The original 

 Philnctis is very little known, the drawing communicated by Schrader 

 to the elder DeCandolle remaining unpublished. But this is without 

 much doubt a second species of the genus, with the awns (answering 

 to the pappus) obsolete, yet in some cases indicated by soft teeth or 

 denticulations, with foliage perhaps not unlike that of P. zinnioides 

 (the leaves at most an inch long), but with a naked peduncle from two 

 to fourteen inches long. The ligule is sessile on the broad and flat 

 ovary. The latter may become trigonal at maturity, but it shows no 

 facial angle. From the appearance of the style and the ovary it may 

 be expected that the disk-flowers are also fertile. The narrow colum- 

 nar receptacle attains the length of fully three quarters of an inch. 



Zaluzania mollissima. Fruticosa (circiter 3-5-pedalis); foliis 

 oblongo- seu rhombeo-ovatis inferne subito petiolatim angustatis in- 

 tegerrimis vix repandis (poll. 1-2 longis) supra ramisque tenuiter 

 floccoso-lanatis subtus tomento denso albo permolli incanis ; pedunculis 

 brevibus 1-3-cephalis ; involucri bracteis oblongis obtusissimis ; ligulis 

 7-8 obovatis subintegerrimis pro capitulo magnis (semipollicaribus) ; 

 acheniis radii pappo tenuiter squamellato nunc ex angulo interno 

 aristellato. — Gravelly ridges south and east of San Luis, Sept. 

 No. 44 G. 



