oQg COMPOSIT.E. Dijsodia. 



leaves alternate, siuiiU, mostly 3 - O-piirteil into lincar-laiiceolatc or sul)ulatG divis- 

 ions wliit'h are seldom yiaiid-beaviiig ; all the upper reduced to subulate })ra(;ts ; 

 those suhtendiiij,' the involucre very short and simple: scales of the involucre linear, 

 abruptly acute, beset with oblong oil-glands, coalescent : rays few and inconspicu- 

 ous : " llowers yellow " : scales of the pap[ius deejjly parted into about *J bristles. — 

 VI Thurb. 3-'2. 



Soutliuuateiii horilcra of the Stiite at Sail Fuhpo (Thurbcr), ami Fort Mohiivo, I)r. Coo/ji'i: 

 Also collected lit Caiup Uiiint, S. Arizoim, hy J>r. Palmer, with more develoiicil leuHets. llciul 

 liulf to three (i»uirtcis of an inch long. Hays linear, not longer than the disk, hardly surpassing 

 tlie style. 



2. D. Cooperi, (ir.iy. .Scabrous-puberulent, "2 feet high," stouter than the 

 l)receding and willi head fully an inch long : leaves (of brunch) lauceolate, rigid, 

 coarsely ami spinulosely few-toothed, and parted near the sessile base so as to form 

 a pair of subulate stipule-like lateral lobes : bracts of the involucre and scales linear- 

 subulate and attenuate-acuminate, gradually i)assing into each other, carinate with 

 strong midrib : rays somewhat exserted, " jiurple " : papi)us as in the preceding. — 

 Proc. Am. Acad. ix. 201. 



youtheiisteru borders of the State, eastern side of rrovidt-nce Mountains, Dr. Coojia: The 

 lower leaves arc ]a-ohably more divided. 



86. NICOLLETIA, Cray. 



Head many-Uowered, with a series of pistillate rays; all the llowers fertile. Invo- 

 lucre cylindraceous, of 8 to 12 equal oblong scales, calyculate with one or two snmll 

 exterior scales. Receptacle convex, naked. Hays oblong, minutely 2 - 3-toothed : 

 disk-corollas slender, S-toothed. Style-branches of the disk-flowers slender, con- 

 tinued into filiform acute hispid appendages. Akenes linear, slender, terete, taper- 

 ing to the base, pubescent. Pappus double ; the outer a series of cai)illary bristles 

 like those of Porop/ii/llam ; the inner of 5 thin chalfy scales with midrib produced 

 into a bristle or awn, n(;arly c(iualling the disk-corolla. — Low and branching 

 glabrous annuals ; with alternate leaves, i)innately divided into a few narrowly 

 linear or subulate lobes, and short-peduncled rather large heads terminating the 

 branches. Oil-glands in the foliage and involucre few and large. Kays pink or 

 purple, the disk-llowers (always/) yellow. —Torr. Frem. Rep. 2d Exp. 315; PI. 

 Wright, i. 119, t. 8 ; P.ot. Mox. l5ound. 93. 



There are two sixcios, both riiro ; one found near the southwestern borders of Texas, tlie other 

 near tiie .soulhcasteni hordi'rs of Cahh)rnia. The genus was dedicate.! to the memory of tlie 

 distinguished geogiaidiical explorer and astronomer, J. N. Nicollet, under whom Fremont unliated 

 Lis work. 



1. N. OCCidentaliS, Gray, 1. c A span or more high : leaves thickish and 

 with short lobes, the uppermost close to the head : scales ui the i)appus lanceolatc;- 

 .subulate, tapering into a short slender awn. 



Sandy banks of the Mohave River. Fremont, Dr. (,;>o/>rr. The latter found it at Camp Cady, 

 and lias recorded tliiil tlu' lays are ])ur|ile, the disk yellow. 



87. POROPHYLLUM, Vaillant. 

 llead several- many llowered, with all the llowers perfei:t. Involucre cylindrical 

 or cylindraceous, of 5 to 10 oblong or linear eipial scales in a single series. Kecep- 

 tacle small, naked. Corollas with a slender or filiform tube, and a narrow 5-cleft 

 limb. Stylc-brandics slender, tipped with a subulate-liliform hispid appendage. 

 Akenes long and slender, nearly terete, striate or anglcil. Pa[)pus of cojjious rather 



