m» 



LXXV. COMPOSITiE. 



4 Pappus capillary. . 

 f Scales Hiuchimbricated. (Pappua plumose. . 

 1 ^spraadjng, petaloid. . 

 T Scales m 2 series, . . {erect, greenish. . 



■ FloweMall perfect C Scales in 1 row or series 



I Receptarle \ Heads heterogamous. 

 f Scales < not chafly, ( Heads dicecious. 



colored. ( Receptacle chafly 



I I Fls. all S Invol. imbricaten. . 



< equal < Invol. calyculate. . 

 Plants Scales <, Herbs. ( Ray flowers larger, sterile. . 



unarmed. I Fls. not an perfect, (.green, i Shrubby. Heads diojcious. 



{( Scales acute- S Achenia smooth, 

 withspinose < cuspidate. .. fAchema rugose, 4-ang!ed. 

 leaves ( Scales emarginatemucronate 

 4 Heads horaogamous. 

 with spinofie heads only, i Heads heterocephalous. . . 



5 Receptacle flat. . 

 < homogamous. \ Receptacle conical. 



5 Heads many, i heterocephalus 



J erect. { Head solitary, terminal . 



(Stem herbaceous, ( chmbing and twining 



S 8. J Stem shrubby. Heads monoecious 



5 Heads corymbose. 

 S erect. \ Heads racemose. . 

 fdty, {spreadmg, petaloid, yellow. 

 I \ green. . 



I 5 erect, close, ( yellowish. 



( Corollas S Scales unarmed, I herbaceous, ( spreading and loose. 



(■Leaves < all equal. (Scales of the involucre doubly spinose 



J akemate. ( Outer corollas enlarged and sterile 



1 t Awns of the achenia retrorsely hi.spid 



$8, iLeaves opposite. (Awns- of the achenia upwardly hispid 



5 Heads small, 

 rinvolucre J Pappus simple. (Hds. very large. 

 J imbricated. (Pappus double. Hds. midl.size. 



((■flat or 1 Involuc. not \ Outer scales verj' short or 0. . 

 J convex. L imbricated. ( Outer scales equal to the inner. 

 J t Ray flowers pistillate. . 



Receptacle not chaflr, (.conical or globose. .. j Ray flowers neutral. 

 S Achenia quadrangular. 

 ( Pappus minute or 0. \ Achenia compressed. 

 (Rays < Pappus of 2 caducoiis awns. Achenia wingless. 

 < sterile. ( Pappus of 2 persistent awns. Achenia winged. 

 Receptactechafly. ( Rays fertile. Ach. obcompressed (parallel withthe scales). 



i Awns of ach. retrorsely hispid. 

 < Involucre double. ; Awns ofach. erectly hispid. . 



(Rays sterile. I Involucre inabricate in 3 or move rows. . 

 5 Achenia obovoid, thick. . , 

 i disk sterile. • • ■ \ Achenia obcompressed, winged. 

 i H Receptacle nearly flat. . 



Rays fertile, C disk perfect. .. . ^ Receptacle conical. . 



j Scales 5, united in 1 row. 

 Vpinnate. ? Sc. in 2 rows, outer row distinct. 

 5 Lvs. opposite, (undivided. Scales- distinct. 

 Recept. not chafly. (Leaves radical, appearing after the solitary head. . . 



i Rays white, shorter than scales. 



4 Receptacle flat. {■ Rays rose color 



S simple. (Receptacle conical, with large paleae. 

 ( Leaves opposite, (pinnately ilnideil. Inner invol. of 8 united scales. 



< \ Heads corymbose 



1 6. ( Leaves all radical ( Head solitary, hef erogamous 



^Achenia silky. Rays about 5. . 

 f Pappus 5 copious. ( Achenia smoothish. Rays 6—100. 

 J simple, (of 2 short bristles and several minute ones. 

 ] t Heads middle size, 



f alveolate. I Pappus double. ( Heads very large. 

 I ( Pappus capillary. Invol. subsimpre. Rays 20—200. 



■Receptacle] < S Involucre depressed, broad, 



not chafly, L smoothish. ( Pappus none. . .( Involucre hemispherical. . • . 



tRays pistillate. 

 CDisk fls. yellow. ( Rays neutral, 

 f Lvs. finely divided. (Disk ffs. white. Rays pistillate, 

 f C3 or 4. 



I 5 Rays very short, white, (5. 



S^ 7. I Receptacle chaffy. L Leaves undivided. ( R&ys very large, purple. . 



tin 2—3 rows. 

 ^Scales of the invol. equal. ( in 1 row. 

 5 Flowers yellow. (Outer scales shortest, pappus capillary. . 



'Lvs. radical. ^Flowers white ; pappus plumose , . 



^Pappa<! single, bristiy.^ 

 ^Lvs. unanried. ( Pap. double, outer scaly. 

 i Fls. yellow. ( Lvs. spinose-dpntats ; pappus very white 

 CABhenia< Flowers blue. Pappus small, scaly. . . . 

 1 not rest. ( Fls. whitish or ci-eam color. Pap. copious, capillary. 

 \ with a fill- Unvohicre with calyculate scales. 



58. 



\ I wiiri ii nil- yinvoiurre Willi u<iiyi:iiiaic .v.(uca. . 



Achenia< form beak. I Involucre without calyculate scales. 



