154 ORDER 70. COMPOSITE. 



d Achenia 10-striate. Flowers purple BKICKELLIA. 9 



d Acheiiia 5-angled. Receptacle conical. Flowers blue COXOCLIXIUM. 12 



Reeeptaele flat. Scales 4 or 5 MIKAXIA. 11 



Scales 820 EUPATORIUX. 10 



e Shrubs. Flower dioecious, the $ and $ in different heads BACCHARIS. 34 



e Herbs. Stem winged. Heads spicate PTEROCAULOX. 35 



Stem wingless. Heads, corymbous, purplish PLUCHEA. 33 



Heads paniculate. Pappus reddish COXVZA. 31 



Pappus white ERECHTITES. 85 



f Receptacle chaffy except in the centre FILAGO. 80 



/ Receptacle naked. Heads dioecious AXTKXXARIA. 79 



Heads heterogamous. Involucre erect GXAPHALIUM 78 



Involucre radiate HELICHRYSCM. 83 



g Scales dry, fadeless. Pappus 4 teeth. Stem winged AMMOBIUM. 81 



a Scales dry, fadeless. Pappus of scale-like awns XERAXTHKMUM. 84 



g Scales herbaceous. Flowers heterocephalous. Fruit a burr XANTHIUM. 48 



Flowers all perfect. Pappus of 5 or 6 scales MARSHAI.LIA. 68 



Pappus of many bristles CARPHEPHORUS. 6 



h Flowers yellow. Pappus 2 inversely hispid awns BIDKXS. 59 



k Flowers yellow. Pappus 2 erectly hispid a'.vns COREOPSIS. 58 



h Flowers whitish, heterocephalous. Anthers yellowish AMHROSIA. 47 



monoecious. Anthers yellow IVA. 46 



all perfect. Anthers black MELAXTHERA. 49 



t Outer scales of the in vol. leafy. Pappus none CARTHAMUS. 9i 



t Outer scales pectinate or ciliate-fringed, or entire CEXTAUREA. 93 



/ Pappus plumous. Achenia obovate CYXARA. 90 



/ Pappus plumous. Achenia oblong CIRSIUM. 97 



j Pappus scabrous, triple, each row by 10's Cxiccs. 95 



simple. Scales spinescent, (Corduus, p. 392, or) OXOPOUDOX. 96 



Scales hooked LAPPA. 98 



t Leaves opposite. Pappus scales deeply cleft into bristles DYSODIA. 62 



% Leaves alternate. Receptacle with deep horny cells BALDWIXIA. 6.8 



Receptacle with shallow fringed cells GAILLARDIA. 63 



Receptacle areolate. Rays all yellow HELLEXIUM. 67 



Rays spotted at base t GAZANIA. 61 



! Leaves opposite. Involucre double, outer 8 united DAHLIA. 23 



I Leaves opposite. Involucre single. Scales united TAGETES. 91 



I Leaves alternate. Pappus of a few short awns or bristles BOLTO.MA. 24 



Pappus a membranous margin MATRICARIA. 73 



Pappus 0. Rays fertile, disk sterile CALENDULA. 91 



Flowers all fertile. Involucre scales equal BELLIS. 22 



Invol. broad, flat '..LEUCANTIIEMCM. 72 



Invol. hemispherical CHRYSANTHEMUM. 75 



*n Rays 4 or 5 Involucre oblong, imbricated. Cypsela very silky SERICOCARPUS. 17 



71 Rays 5 75 Involucre loosely or closely imbricated. Pap. simple, copious... ASTER. 18 



m Rays 8 12 Involucre imbricated. Pappus double, the outer very short DIPLOPAPPUS. 19 



m Rays 40200. Involucre scarcely imbricated, scales nearly equal ERIGKROX. 20 



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



n Flowers all fertile. Native. Scales subequal, flat. Fruit smoothish ERIGEROX. 20 



Exotic. Scales subequal, keeled. Fruit hairy AGATHEA. 16 



Exotic. Scales imbricated. Pappus double CALLISTEPHUS. 21 



o Pappus double in the disk flowers, none in the rays HKTEROTHECA. 29 



o Pappus double in both disk and ray flowers CIIRYSOPSIS. 30 



p Heads large, about 20-rayed. Pappus in one row IXULA. 32 



p Heads very small, 1-15-rayed. Pappus 1 row, shorter than achenia BRACHYCH.KTA. : 5 



Pappus 1 row, tawny, longer than achenia ISOPAPPUS. 28 



Pappus irregularly 2-rowed, white SOLIDAGO. 26 



r Head solitary, on a scape with alternate bracts TUSSILAGO. 13 



r Heads corymbed, Ac. Leaves alternate SEXKCIO. 87 



Leaves opposite ...ARXICA. 88 



Shrubby. Pappus 4-toothed, obscure BORRICHIA. 36 



a Herbaceous. Scales (the 4 outer) united inlo u cup TKTHAGONOTHKCA 52 



