COMPOSITiE. 55 



yellow, wanting only in certain species (much reduced and inconspicuous in a section 

 of Erigcron and one of Aster). Eeeeptucle naked (not paleaceous), with an occasional 

 exception. 



* Pappus of both disk and ray none or coroniform. 



-f— Invohicre broad, mauy-flowered : rays numerous, fertile, conspicuous. 



35. BELLIS. Bracts of the involucre nearly equal in length, herbaceous or somewhat 

 nieud)ranaceous. Jieceptacle conical or hemispherical. Style-brauclies tipped with a short 

 triangukir appendage. Akeues obovate and comj^ressed, nerveless except at the mai-gins. 

 Pappus none. 



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

 lauceolate, somewhat herbaceous witli scarions apex and margins, tlie outer sliorter. Kecep- 

 tacle conical or hemispherical. Styledn-anches witli a very sliort and obtuse appendage. 

 Akeues prismatic or terete, truncate : the broad apex bordered with a short coroniform and 

 eitlier dentate or entire and minutely setulose-ciliate pappus. Base of corolla-tube often 

 skirrous-thickened in age. 



37. GREENELLiA. Bracts of the involucre imbricated in a fow'series, the outer shorter, 

 all oblong, coriaceo-chartaceous, with scarious margins and an herbaceous dorsal. tip. Re- 

 ceptacle flat, barely couvex. Style-branches with a linear rather obtuse appendage, which 

 is four times the length of the quadrate stigmatiferous portion and much exserted. Akenes 

 short, somewliat turluuate, obscurely 8-uer\'ed, hispidulous. Paj)pus a hyaline-scarious 

 crown cleft into numerous setulaj or denticulations. 



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



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

 few series, of uuecpial length, oblong, smooth, thin-memlirauaceous with scarious margins, 

 mostly setaceously mucrouate. Receptacle small and flat. Rays 5 to 15, with oblong ligule 

 on a slender tube. Style-appendages either short and obtuse or long and slender. Akenes 

 obovate and compressed or subclavate, 2-.3-iierved, and with vcr}- small epigynous disk; 

 those of the disk-flowers mostly sterile. Pajipus minute and coroniform or evanescent from 

 the mature akeues. 



* * Pappus of solitary or few setiform awns or bristles and of a few paleaj or a crown : 

 rays conspicuous, fertile : akenes without Avings or callous margins : rece^jtacle flat or 

 nearly so. 



39. CHJETOPAPPA. Involucre several-manj^-flowered, campanulate or narroM'er ; its 

 bracts oblong or lauceolate, thin-herbaceous, with scaritras margins and tip, imbricated in 

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

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

 compressed, 2-5-nerved. Pappus of five or fewer thin and nerveless short palesc, alter- 

 nating witli as many or fewer mostly long and setiform scabrous awns, or the latter some- 

 times Avantiug. 



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

 almost ill a single series, narrowly linear, somewhat herbaceous. Rays numerous ; the ligule 

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

 villous. Style-appendages triangular and obtuse. Akenes oblong-obovate, compressed, oue- 

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

 short and cui)uliform barely denticulate crown, and a single setiform awn which is barbellate 

 or plumose toward the apex. 



* * * Pappus short-setulose or squamcllatc and mostly Ijiaristate, i. e. a ring of very short 

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

 edge of the broad and flat winged or callous-margined akene : involucre nuiny-flowercd, 

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

 tacle strongly convex or low conical : rays conspicuous, fertile ; their akenes occasionally 

 .■5-winged. 



41. DICH^TOPHORA. Involucre somewliat uni.serial; the lanceolate bracts of equal 

 length. Style-appendages of the disk-flowers triangulardanceolate. Akenes surrounded by 

 an almost orbicular firm wing, its edge ami the body of the akene glocliidiate hispid. 

 Pappus of two divergent awns i.bout half the length of the akene, and of several minute 



