COMPOSITJE. 55 



yellow, wanting onlj- in certain species (much reduced and inconqiicuous in a ;ection 

 of Erigeron and one of AsUr). Receptacle- naked (not paleaceou^), with an occasional 

 exception. 



- Pappus of both disk and ray none or coroniform. 

 -i— Involucre liroad, many-liowered : ra^> numerous, fertile, con^]dcuous. 



35. BELLIS. Bracts of the involucre nearly eiiual in length, herbaceons or somewhat 

 membranaceiius. Keceptacle conical or hemispherical. Style-branchi? tipped with a short 

 triangular appendage. Akenes obovate and comjire^sed, nt-rveles* except at the margins. 

 Pappu- none. 



36. APHANOSTEPHUS. Bracts of the involucre imbricated in few series, broadly 

 lanceolate, >omewhat herbaceous ^Wth scarious apex and margins, the outer slii irter. Recep- 

 tacle conical or hemispherical, style-branches mth a very sliort and oljtuse appendage. 

 Akenes prismatic or terete, trimcate : the broad apex bordered with a short coroniform and 

 eitlier dentate or entire and minutely setulose<'iliate jiajijius. Base of corolla-tube often 

 skirrous-thickened in age. 



37. GREENELL A. Bracts of the involucre imbricated in a few series, the outer shorter, 

 all o^kalu^ coriaceo-chartace-jus. with scarious maririus and an herbaceous dorsal tip. Ee- 

 ceptade flat, barely cuuvex. style-branches with a- linear rather obtuse appendage, which 

 i^ four times the length of tlie quadrate stigmatiferous portion and much exserted. Akenes 

 short, ^'.tmewliat turbinate, oliSL-urelv 8-ner\"ed, hispidulous. Pappus a hyaline-scarious 

 crown cleft into numerous ?eculae or denticulatiijus. 



4— -4— Involucre narrower and flowers less numerous. 



38. KEERLIA. Involucre narrowly campanulate or turbinate; its bracts imbricated in 

 few serie?. of vmequal length, oblong. sninCith. thin-membranacc-'iis -nith srarious margins. 

 mostlv st-raceously mucronate. Receptacle small and flat. Pay:? 5 to 15, with oblong hgule 

 on a .^lender tube, srvle-appendages either short and oljtuse or long and >lender. Akenes 

 obovate and compressed or subclavate, 2-.>-nerved, and vrith very small epigvnous disk ; 

 those of the disk-flowers mostly ^te^ile. Papptis minute and coroniform or e^ aiieseeni from 

 the mature akenes. 



* * Pajijius of Si 'litary or few setiform awns or bristles and of a few palete or a crown : 

 rai"- c'liispieuous. fertUe : akenes without wings or callous margins: reeeptacle flat or 

 nearly so. 



39. CH.STOPAPPA. Involucre several-many-flowered, campanulate or narrower ; its 

 bracts oblong or lanceolate, thin-herbaceous, with scari. jus margins and tip. imbricated in 

 two or more ranks, the outer shorter. Rays 5 to 20 ; the hgule oblong, raised on a slender 

 tube. Disk-flowers often sterile : their style-appendages short. Akenes either fusiform or 

 compresseil, i-S-nerved. l'apjni~ of five or fewer thin and nerveless sliort paJese, alter- 

 natino- vrith as manv or fewer mostly long and setiform scabrous awns, or the latter some- 

 times wanting. 



40. MONOPTILON. Involucre many-flowered, broad; its nnmercjus bracts equal and 

 almost in a sin'^'le series, narrowly hnear, somewhat herbaceous. Pay-; numerous : the hgnle 

 obovate or oblong and with a rather long tube : this and the tube of the disk-coroUa sparsely 

 villous. Scvle-appeni-la::es triangular and obtuse. Akcues oMoug-^jbovate, compressed, one- 

 nerved at each margin, or the outermost also on one face. Pappus both in disk and ray a 

 short and cupuliform barely denticulate crown, and a single sctiiorm awn which is barbeUate 

 or plumose toward the apex. 



* * ^ Pappus short-setuL jse or squameUate and mostly biaristate. i. e. a ring of very short 

 bristles or setiform squameUae and a pair of naked upward-tapering awns, one over each 

 edge of the broad and flat winged or callous-margined akene : involucre many-flowered, 

 hemispherical or broader; the bracts somewhat herbaceous and thin-margined: recep- 

 tacle stronglv convex or low conical: rays ccnspicuous. fertile; their akenes occasionally 

 3-winged. 



41. DICH.,51TOPHORA. Involucre S'niewhat uniserial; the lanceolate bracts of equal 

 leno-th. stvle-appendages of the disk-flowers triangular-lanceolate. Akenes surr.juuded by 

 an almost orbicular firm wing, its edsre and the body of the akene glochidiate-hispid. 

 Pappus of two divergent awns about half the length of the akene, and of several minute 



