308 PROCEEDINGS OF THE AMERICAN ACADEMY 



fuiulius bilabiata, labio postico semibifido, an'^ico tripartito, lobis 

 lauceolatis acutis ; antheris ante dehiscentiam glabris ; stigmate inl'uii- 

 dibuliformi-dilatato fere orbiculato. — In the Mohave district, S. E. 

 California and adjacent Arizona ; first collected at Fort Mohave by 

 Dr. J. G. Cooper^ iu 18G0, who states that the tuber-like base is bitter, 

 but is eaten by the Indians; collected at Camp Lowell, Arizona, by 

 Parish and by Lemmon, 1881, also, in the same year, in the Santa 

 Catalina INIountains, by Pringle, and distributed as A. Ludovicianum, 

 var. Cooperi. But it is evidently a distinct species. 



AcanthacecB. 



DrCLiPTERA PSEUDOVERTiciLLARis. Inter Platystegias et Sphe- 

 nostegias media, annua, a basi ipsa ramosa et florens, fere glabra, 

 vix pedalis ; caulibus ramisve diffusis ; foliis cauliuis inferioribus 

 ovatis acuminatis (ultra-poUicaribus) longe petiolatis, superioribus 

 multo minoribus ovato-ellipticis brevipetiolatis involucris axillari- 

 bus subsessilibus foliiformibus plerumque a^quilongis ; bracteis invo- 

 lucri primum patentibus deltoideo-rotundatis obtusissimis retusisve 

 (raro mucronulatis), basibus subito contractis in cyathum angustum 

 ssepius coalitis ; corolla brevi iuvolucrum baud superante ; seminibus 

 processibus subulatis sub lente setuliferis muricatis. — N. W. Sonora, 

 Mexico, in the valley of the Altar, April, 1884, Pringle. And imper- 

 fect specimens of seemingly the same species, with the narrowed bases 

 of the involucral bracts mostly distinct, were collected by Thurher, in 

 1851, at Bacuachi, in the same district. In Mr. Pringle's specimens 

 through all the upper part of the stem the involucres (which are shorter 

 than the internodes), one iu each axil, are about the length of the sub- 

 tending leaves, their two leaves quite as broad as they, and at first 

 open so as to give a verticillate appearance to most of the foliage. I 

 take this opportunity to distinguish two species of Didiptera of the 

 Arizono-Mexican rejjion which have been confounded. 



DiCLiPTKRA RESUPiNATA, Juss. Caulc laxe ramoso e radice 

 annua ; foliis ovatis vel ovato- seu oblongo-lanceolatis longiuscule pe- 

 tiolatis ; involucri bracteis cordato-rotundis ; semiuibus ut in pra'ce- 

 dente muricatis. — I follow Nees in applying this name to an annual 

 plant, and in supposing that Cavanilles was wrong iu taking his Jas- 

 ticia sexangidaris for a j^erennial, as also was Vahl in following him. 

 I also suppose that the character, well represented by Cavanilles, of 

 some subsessile and some long-pedunculate involucres, is not constant, 

 the former being mostly wanting in our specimens. From the habitat 

 it is not so probable that the following species was known a hundred 



