322 plantjE novje thurberian;e. 



Dysodia porophyli.oides (sp. nov.) : glabrum, c basi frutcsccntc ramosissimum ; ra- 

 mulis striatis supcrnc fcrc nudis monoccphalis ; foliis parvis plcrisque altcrnis bi-tri- 

 partitis, scgmcntis filiformi-subulatis mucroiiatis cglandulosis, supciioribus in bracteas 

 subulatis minimis transeuntibus ; involucro tuibinato 12-14-phyllo basi bracteis toti- 

 dem brcvissimis subulatis integerrimis muticis cincto ; ligulis paucis involucium et 

 pappum 10-palcaccum vix superantibus ; receptaculo fere uudo. — Sandy hills, near 

 San Felipe, between San Diego and the Colorado, California ; May, 1852. — Branches 

 rigid, 1 i to 2 feet high, from a frutescent base. Leaves (those of the flowering 

 branches alone seen) from nearly an inch to a quarter of an inch long, gradually re- 

 duced into bracts of one or two lines in length ; the larger with their divisions some 

 times 1 - 2-toothed, mucronate, but not sctigcrous. Involucre about half an inch long ; 

 the scales coalcscent into a cup, linear, beset wdth oblong or linear glands ; their free 

 tips somewhat scarious, rather obtuse. The few and inconspicuous rays consist of a 

 linear ligule, the lower part of which is convolute around the style, w hile its expanded 

 apex very little surpasses the stigmas. Pappus 3 lines or more in length ; the paletc 

 much like those of D. poropIi^Ua, but the undivided portion considerably longer. 



PsATiiYROTES iNcisA (sp. nov.) : aracliuoideo-lanata ; caulibus humifusis dichotomis ; 

 foliis cuneato-oblongis argute iuciso-lobatis, lobis dentibusve cuspidato-acuminatis ; pe- 



fallen. My kind friend Dr. Torrey having furnished mo with some sketches and (lowering heads, from 

 specimens subsequently gathered by Dr. J. M. Bigelow, while connected with the Mexican Boundary Com- 

 mission, I have learned that the plant is not a Hclcrospcrmum, although allied to that genus, but it forms a 

 new generic type, the characters of which are briefly subjoined. 



DICRANOCARPUS, Nov. Gen. 



Capitulum pauciflorum ; floribus.e.\terioribus 3-4 fcemineis subradiatis, ligula minima 2 - 3-loba stylo bre- 

 vioro ; disci totidem stcrilibus, tubo corolkc cylindrico, limbo cyathifornii 5-fido. Involucrum 1 -2-bracteo- 

 latum (bracleolis lincaribus parvis), S-l-phyllum : squama; oblongw, obtusoc, mcmbranacea3, crccta-, sub- 

 planai, demum decidua;. Reeeptaculum planum : palea; lineares pnrva; inter florcs. Anthcra; oblonga;, 

 ecaudatffi. Stylus fl. masc. inclusus, indivisus, apice clavato pubesccns ; fl. foem. bifidus, ramis inappendicu- 

 latis. Ovaria disci inania, epapposa. Achcnia (radii) difTormis, ncmpe 1-2 linearia vol subulata, subtcrctia, 

 Itcvia, pcrsistentia, aristis 2 validis la;vissiniis divergcntibus seu rccurvis persistentibus cornuta ; ea.>tera brovi- 

 ora ct crassiora, intus sa;pe tuberculato-rugosa, aristis brevioribus vel obsoletis. — Herba annua, gracilis, fere 

 glabra, Heierospenni facie, microcephala ; foliis oppositis 3-5-scctis, summisve integris, filiformibus ; capi- 

 tulis solilariis pedunculatis ; floribus flavis. 



DiCKANOCARPus PARViFLonns. — Heterospcrmu?n (licranocarpuiii. Gray, PI., Wright. 1. p. 109. 



