388 PROCEEDINGS OF THE AMERICAN ACADEMY 



in those of Pa]mer (245), and hardly less so in those of Leramon from 

 S. Arizona. They are described in Syn. Fl. i.^ 239 as " little tubercu- 

 late or smooth." 



Parthenium tomentosum, DC. Prodr. v. 332. River-bank, near 

 Batopilas, Pa/mer, 123. "A large, bushy jdant, 5 feet high," with 

 leaves 7 or 8 inches long and a petiole of 2 inches. No pappus. Ap- 

 pears to agree well with DeCandolle's species, which comes, however, 

 from the southern State of Oaxaca. 



Tragoceros Mocinianus. T. zinnoides, HBK., perquam similis ; 

 ligulis apice tantum bifidis haud fissilibus ; costis achenii tuberculatis. 

 — Zinnia bicuspis, DC. Prodr. v. 535, Mo^ino & Sesse, Ic. Fl. Mex. 

 t. 573, in which the rude figure from which DeCandolle took the char- 

 acter " achseniis disci uniaristatis " was probably misapprehended. 

 Bentham may with reason suspect that the described species should 

 be reduced ; and DeCandolle's two sections are probably of no account ; 

 for the tuberculation of the akenes does not appear on the well-grown 

 ovary of the present plant, and in other genera this is a fallacious 

 character. But inasmuch as this plant has not the divided and two- 

 horned ligules of the original species, and has strongly tuberculate ribs, 

 it may for the present be kept distinct. The larger heads and the 

 long rays distinguish it from T. ScMedeanus. — Hills at San Jose, 

 south of Batopilas, with " creamy white bloom," Palmer, 67. 



Zaluzania discoidea. Z. ancjustcB et Z. mollissimce vere con- 

 gener, sedherbacea e rhizomatibus repentibus et ligulis nullis; pube 

 minuta canescens ; caule simplici 2-4-pedali e basi parum lignescente ; 

 foliis lato-ovatis brevi-petiolatis subintegerrimis amplis (sa?pius 4-polli- 

 caribus) supra glabratis A'iridulis subtus albo-tomentulosis ; capitulis 

 parvulis (lin. 3 altis) subglobosis plurimis in cymam nudam fastigiato- 

 compositam digestis ; involucro brevi. adpresso canescente ; corollis 

 achenio brevioribus. — Along streams among the hills west of Chi- 

 huahua, Pringle, 309. 



MoNTANOA PATENS. Fruticosa, tcnuiter puberula ; caule orgyali 

 laxe ramoso ; ramis floridis gracilibus patentissimis capitula sparsim 

 cymosa graciliter pedunculata gerentibus ; foliis membranaceis acu- 

 minatis subserrulatis. caulinis (inferioribus haud visis) superioribus 

 deltoideo-ovatis angulatim sub-3-5-lobatis juxta basim ssepe biauricu- 

 lato-appendiculatam triplinerviis (poll. 4-5-longis et petiolo nudo ses- 

 quipollicari), ramorum ovato-lanceolatis subintegris ; involucri bracteis 

 angustis disco lin. 2-3 alto paullo brevioribus ; ligulis 6-8 obovatis 

 lin. 4-5 longis albis ; paleis receptaculi per anthesin ovato-oblongis 

 mucrone mox recurvo apiculatis, fructiferis maxime ampliatis charta- 



