r>y^ COMPUSIT.E. ralaj'uxai. 



limb very deeply cleft or parted into narrow linear lobes. One ol" the following species occui-s 

 on tlie soutlieastern borders of the State ; the other only further south, but it is here included 

 for comparison. 



1. P. linearis, Lugascu. Herbaceous, cinereous scabrous, a foot to three I'cet in 

 lioight : loaves linear or linear-lanceolate, mostly ucuto : heads narrow, loosely 

 corymbose and slender pednncled : scales of th^o involucre narrow linear in a single 

 series : fiowei-s all perfect and alike or nearly so : the pale purple corollas with lobes 

 shorter than the elongated nearly cylindrical throat : i)appua of 4 to 8 linear scales, 

 which are more or less pointed or short awned by tiio projection of the tai)ering tip 

 of the very stout midrib, nearly t-ipudling the corolla, or in the iiuter llowers some- 

 times very short and blunt.- - llo(»k. i)ot. Mag. t. 21."J2. A(/enUuvi liiitare, Cav. 

 Ic. iii. t. iiOf). 



vVlong the Colorado, at Fort Yuma, Mohave, &c., Coulter, ISchoU, Newberry, Cuofier. Extends 

 through the adjacent parts of Arizona to Mexico. Heads an inch or less in length. Tliis is tlic 

 species on which the genus was founded. 



2. P, leucophylla, Gray. Shrubby, 6 to 10 feet high : leaves linear, obtu.se, 

 thickisli, wliitened willi a close and dense silky-hirsute pubescence : papjjus of 4 

 linear-oblong blunt ami emarginate-scales, consideraldy shorter than the flesh- 

 colored corolla and the -1 alternate shorter ones, Avhich are S[)atulate-oblong, with 

 midrib vanishing at the niiiUlUi ; some of the outer akenes with u short i;orneons 

 crowu instead of the scales: otherwise nearly as in the preceding. — Vnn,. Am. 

 Acad. viii. 291. 



Carmen Island, in the Gulf of California, Dr. Palmer. 



77. CHiENACTIS, DC. 

 Head homogamous ; the ftowei-s all perfect and tubular, but an outer series almost 

 always more or less enlarged, usually forming a sort of ray. Involucre campauulate 

 or hemis])herical ; its scales narrow, more or less herbaceous, equal, in one or two 

 Hurios, usually becoming concave and inclined to embrace subtonded akones. Ke 

 ceptacle Hat, foveolate antl naked, in one species with bristle-shaped rigid chalf sub- 

 tending most of the llowers ! Corollas tubular inclining to funnelform, ami with 5 

 short obtuse lobes, or the marginal ones either slightly or conspicuously enlarged 

 above, with the dilated linxb 5-cleft, sometimes irregularly or obli([uely so, approach- 

 ing to palmate ; their nerves deeply intramarginal. Anthers linear. Style-branclies 

 narrow, tapering into a slender-subulate or occasionally obtuse minutely hirsute 

 appendage. Akenes slender, linear, tapering to the base, more or less 4-angled, 

 commonly pubescent. Papi)us of 4 to 12 awnless and nearly or quite nerveless 

 liyaline chaffy scales (in the marginal llowers mostly shorter), in one anomalous 

 species wanting. — Herbs, chielly of humble stature, annuals or biennials (or some 

 po.ssibly perennial), all of the Californian region ; with alternate 1 - 3-pinnately 

 dissected leaves, and middle-sized or large pedunculate heads of yellow, white, or 

 llesh-colorcd llowers terminating the loose or (toryndxtse branches. — Gray, I'roc 

 Am. Acad. x. 7:5. 



Macrocarphiis, Nutt., haidly forms a primary section, ami (,'. carphodinia, with its anomaly 

 of chaff to tlic receptacle, is otherwise just like the related species. In one or two species the 

 receptacle might perhaps be said to be cliatfy next tlie margin, there being two ranks of invu- 

 lucral scales subtending llowers. 



§ 1. Pappus })rf!itiU. — True Cii.enactis. 



* doroUan yellow, llit outerjiuml outs abviouult/ tulaiytd at the suinviit, and l/itir 

 liiiili iiKjrf or A-.v.s- irrc(/iilarli/ rt-loltrd, fonuliu/ a .'«iji of ra//. 



