Order VO.— COMPOSITE 400 



eShrnbs. Flower dioDCioaSt the $ and g in different heads ^ Ba-ochabis. 86 



e Herbs, — Stem winged. Heads splcate PxEROCAnLOH. 3<t 



— Stem wingless.— Heads corymbous, purplish Pluciiea. 84 



—Heads paniculate. — Pappus reddish Conyza. 82 



— Pappus white Eeecutiths. 83 



f Receptacle chaffy except in the center Filago. 80 



f Eeceptacle naked.— Heads dicecious ^ntennaeia. 79 



— Heads heterogamous. — Involucre erect GNAPiiALinM. 78 



— Involucre radiate IlELionETstrsi. 82 



g Scales dry, fadeless. Pappi^ of scale-like awns Xekanthemuu. 81 



g Scales herbaceous. — Flowers dicecious. Fruit a burr XANTniuii. 46 



•— Fls. all perfect.— Pappus of 5 or 6 scales Maeshallia. 68 



— Papp. of many bristles CAEPnEPiionnfl. 6 



h Flowers yellow. Pappus 2 inversely hispid awns Bidens. 68 



h Flowers yellow. Pappus 2 erectly hispid awns ■. . Coreopsib. 57 



h Flowers whitish,— difficlons. Anthers yellowish Ambrosia. 45 



— moncecious. Anthers yellow Iva, 44 



— all perfect Anthers black MKLANTnERA. 47 



1 Outer scales of the invol. leafy. Pappus none C ARxiiAMue. 98 



i Outer scales pectinate or ciliate-fringod Centaurea. 91 



i Outer and inner scales obtuse, entire Amberboa. 92 



J Pappus plumous. Achenia obovate Ctnara. 89 



J Pappus plumous. Achenia oblong Ciesium. 96 



j Pappus scabrous, — triple, each row by lOs Cnicus. 94 



— simple. — Scales spinescent Onopordon. 96 



— Scales hooked Lappa. 97 



k Leaves opposite. Papp. scales deeply cleft into bristles Dysodi a. 61 



k Leaves alternate. — Rays fertile IIelenium. 65 



— Rays sterile. — ^Receptacle naked or fimbriate Gaillardia. 62 



— Receptacle areolate, Leptopoda. 66 



—Receptacle deeply-celled Baldwinia. 67 



1 Leaves opposite. Involucre doable, outer 3 united Dahlia. 23 



I Leaves opposite. Involucre single ; scales united Tagetes. 89 



I Leaves alternate. — Pappus of a few short awns or bristles Boltonia. 24 



— Pappus a membranous margin Matricaria. T8 



— Pappus 0. — Rays fertile, disk sterile Calendula. 90 



— Fls. ail fert.— Invol. scales equal Bellis. 22 



— Invol. broad, flat Lkuoantiikmum. 72 



— ijivol. hemispherical CnRYSASTiiEMUM. 74 



m Raya nutral, sterile, 8 — 12 ; Pappus simple Galatella 16 



m Rays pistillate, fertile, — about 6. Achenia very silky Sericogarpus. 17 



— 8 — 12. Pappus double Diplopappus. 19 



— 5 — ^75. Pappus simple Aster. 18 



— 4C — 200, white. Scales equal Erigekon. 20 



n Flowers dioecious, purplish. Leaves all radical Nakdosmia. 14 



n Fls. all fertile. — Outer pappus or very short bristles Euigeron. 20 



— Outer pappus a crown of short, pointed scales CALLisTEPnus. 21 



O Flowers of the disk mostly sterile. Rays 30 — 40 *Prionop8I3. 29 



O Fls. all fertile. — Pappus double in the disk, none in the ray Heterotucca. 80 



— Pappna double in both disk and ray Chrysopsib. 81 



p Heads large, about 20-rayed. Pappus in one row Inula. 83 



p Heads very small, 1 — ^15-rayed.— Pappus 1 row, shorter than achenia. . .BRACHYciijyA. 25 

 — Pappus 1 row, tawny, longer than achenia.. IsopAPPue. 28 



— Pappus irregularly 2-rowed, white Solidago. 26 



r Head solitary, on a scape with alternate bracts Tubsilago. 18 



r Head3 corymbed, &c. — Leaves alternate Seneoio. 86 



— Leaves opposite A rnxca. 87 



8 Shrubby, Pappus 4-toothed, obscure Borriohia. 87 



■ Herbaceooa.— Scales (the 4 outer) united into a cup Tktk agonothboa. 50 



^Scales distinct.— Achenia 4-angled. Pappus yHELiopsis. 49 



— Achenia flattened. Pappus Acmella. 59 



— Ach. flat, with a 2-awned pappus Vereesima, 04 



