. COMPOSITE. 



t, 10. Centauridium Drummandii, Torr. ^ Cray, Fl. ii. i'4r, ; Cray, I'l. Lindh. ii. 2^,'i 

 Machceranthera grandiflora, Buckley in 1'roe. Acad. I'liilad. Istil, 4.JO. Open woods, Texas] 

 Berlandier, Dntnnnond, Liiidheimer, \c. ; tl. all summer. 



30. APLOPAPPUS, ('ass. ('ATrXo'os, wan-n-os, simple pappus.) A lar-v 

 American genus (chiefly W. North American and Chilian) the analo-ne ,,f .[.v/~,- 

 in the heterochromous division and equally polymorphous ; ni<il\ herbaceous 

 perennials, sonic suffruticose or even shrubby, a few annual: the lio\\rrs all 

 yellow, prodncrd in sninmer and autumn.-- Diet. Ivi. 1 C,s. //,f/>ln/>,ij,j,its ^ /;,-;. 

 cameria, Bcnt.li. & Hook. (Jen. ii. :>,">;>, L>;>r>. Note that one or two species 

 occasionally and certain species uniformly want the ray-flowers, obliterating the 



distinction between this genus and the following! 



1. PRIONOPSIS, Gray. Heads very large and broad: imolueiv depressed- 

 hemispherical, of lanceolate acuminate bracts, the outer mostlv foliaceoiis and 

 spreading: rays very numerous: di.sk-corollas narrow, merely /Mouthed: stvle- 

 appendages .short and rather obtuse: akencs very glabrous; those of I lie raj 

 short. turgid-elliptical; of the disk oblong or narrower, and the central ones 

 inane: pappus of very rigid and unequal bristles and comparatively little nu- 

 'merous; the innermost and larger ones somewhal llaJtcned toward the base and 

 their margins scabrons-ciliolate ; the outermost very small and short: mot aiinnid 

 or biennial. --P1. Wright, i. '.IS. /V/o/^yW.s-, Xntt. Trans. Am. Phil. Soc. 

 n. ser. vii. 329. -- (Connects with Xnntliixnut and has the i'olia^o of Grimlclia.} 



A. ciliatus, DC. Very g-lalu-uiis: stem 2 to 5 !'(.( lii-h. l.cai-in-- few or several somewhat 



cymose-clustered lu-ads (with tin- di.-k an inch in dianiorr). i-,|naMv Ical'v to (lie top : l,-i\ ea 

 oval or the lower oliovate (1 to :i inches long-), very olmi,-e, veiny, eM'iih and soineuha! 

 peCtinately dentate With liri^'le-pointed teeth: pa])pUS of the fertile akenes dis|io.sed (o I,,. 

 deciduous ill a rinsj,-. I'mdr. v.346; (ira\. 1M. Wri.ixlit. i. <)S. llonin cilinln. Null. .lour. 

 Aead. I'hilad. ii. 118; Hook. I'.\ot. Fl. i. t. 45. J^rimio/isia c!Hnl,i, Xntt. 1. c. ; Torr. X 

 Gray, Fl. ii. 245. Hillsides and river-banks, .Missouri and Kansas to Tex:; 



2. APLOPAPPUS proper. Heads large or middle-si/ed, or sometimes ymall. 

 commonly broad and with involucre of firm well-imbricated or ri^id bracts: rays 

 numerous, several, or rarely wanting: disk-corollas narrow, inerelv ."Mouthed: 

 style-appendages from ovate to linear-subulate: pappus commonly fuscous or 

 rufous, and more or less rigid. (Habit and special characters various, but tin- 

 groups too confluent and indefinite for first-class sections.) 



* Heads niylcvs: liraets of (he involucre ri^id, appressed-imbricate with the outer 



shorter, all with abrupt and more or less j-pi-eadiu^ herbaceous tips: style-appeuda.ircs ovate- or 

 oblong-lanceolate: pappus rather rigid: leaves coriaceous, mostly oblong and spiimlose-dcutate. 

 Aplopappus A/i/i'i/iacit.i, Torr. & I ir:iy, Fl. ii. 24:2, excl. the, lir.-t species, which is A/i/<></!?- 

 cns, DC. Haplodiscus & /.'//'(" trpa i, licutli. & Hook. 1. c. (One of the transitions to / 

 Itiria Afiloi/ifi-ns.) 



A. SquarrOSUS, HOOK. & Anx. Snt'lVntieo--c, 2 or ;) feet hii2;li, somc-wliat pulioscrnl, gland- 

 ular and ylntinons : lea.vos thickly dentate (about inch lout;) : he-ads numerous and sjiieatelv 

 thyrsoid at the end of the branches, half-inch long : involucre elongated-! urbinate ; its bracts 

 imbricated in many ranks, the lower usually imbricated on the peduncle, their tips mostly 

 squarrose and glandular: akencs fusiform, glabrous, or sparsely pubescent. Bot. IJcech. 

 146; Torr. & dray, Fl. ii. 242. Pi/rrocoma urinddionli-a, IX'. 1'rodr. y. 350. Homopappus 

 sqitarrosms, Nntt. Trans. Am. Phil. Soc. 1. c. 3.'>2. Dry hills on the coast of California, from 

 Monterey to San Diego; first coll. hy Douglas. Also on the foot-hills of the San Bernardino 

 Mountains, Parish, &c. 



A. Nuttallii, TORH. & GRAY, 1. c. Herbaceous from a ligneous stock, a span to a foot 

 high: leaves from spatulate- oblong to almost lanceolate, rather sparsely pectiuately dentate: 



