306 PROCEEDINGS OF THE AMERICAN ACADEMY 



Zygophyllacece. 



TRIBULUS, Tourn. The genera Kallstrcemia, Scop., and Trihu- 

 iopis, R. Br., which there had been some reason for retaining, are 

 now effectually suppressed by finding that Tribulus Californicus, Wat- 

 son, has a deciduous calyx along with a 10-carpellary ovary with uui- 

 ovulate carpels, but the alternate ones abortive. 



GUATACUM, Plumier. It is noted in PI. Wright, i. 28, that the 

 position of the cotyledons of Porlieria hygrometrica is not uniform, 

 these being sometimes incumbent and sometimes accumbent in respect 

 to the floral axis. They are also incumbent, at least occasionally, in 

 G. officinale ; and in G. arboreiim the filaments are more or less 

 squamiferous, while G. jjarvifoUum has tetramerous as well as pen- 

 tamerous flowei's ; and a nearly related species, G. Planchoni ( G.par- 

 vifoUum, Planchon in herb. Hook., of which see PI. AVright. 1. c. 29, 

 and of Hemsley as to Andrieux's plant), has naked filaments. It is 

 therefore evident that the genus Porlieria cannot be kept up. 



2. Sertiim Chihiiahuense : appendix. 



The following are new Gamopetalce of Mr. Pringle's collection 

 in the State of Chihuahua, Mexico, in the summer and autumn of 



]886. 



BouvARDiA GRACILIS. Undique glabra, ramulosa ; ramis gracili- 

 bus crebre foliosis ; foliis oppositis tenui-membranaceis ovato-lanceolatis 

 brevissime petiolatis (majoribus sesquipollicaribus, ramealibus nunc 

 parvulis), veuis tenuibus parcis inconspicuis ; floribus paucis brevissime 

 pedicellatis in fasciculo subsessili ; calycis lobis subulatis (lineam longis) 

 tubo in anthesi multo longioribus capsula Icevi (lin. 2 longa) breviori- 

 bus : corolla glaberrima alba, tubo fere filiformi semipollicari, lobis 

 ovalibus lineam longis. — Mapula Mountains, twenty miles south of 

 Chihuahua, in shade of cliffs. 



Brickellia solidaginifolta. Multicaulis, puberula ; caule ultra- 

 bipedali e caudice perenni herbaceo sursum crebre ramoso, ramis usque 

 ad capitula corymboso-congesta brevi-pedicellata foliosis ; foliis pleris- 

 que alternis lanceofetis integerrimis basi angusta sessilibus submem- 

 branaceis tenuiter venosis (1-2-polUcaribus) ; involucro 10-floro lin. 

 3 longo bracteis pauciusculis binervatis acutiusculis, interioribus floribus 

 dimidio brevioribus lineari-lanceolatis, extimis brevibus subovatis ; 



