54 ORDER 70. COMPOSITE. 



d Achenia 10-striate. Flowers purple ...BRICKELLIA. 9 



d Achenia 5-angled. Receptacle conical. Flowers blue COXOCLIXIU*. 12 



Receptacle flat. Scales 4 or 5 MIKANIA. 11 



Scales 820 EUPATORIUM. 10 



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



e Herbs. Stem winged. Heads spicate PTEROCAULOX. 35 



Stem wingless. Heads, cory mbous, purplish PLUCHE A. S3 



Heads paniculate. Pappus reddish CONYZA. 31 



Pappus white ERKCHTITES. 85 



f Receptacle chaffy except in the centre FILAGO. 80 



/ Receptacle naked. Heads dioecious ANTEXXARIA. 79 



Heads heterogamous. Involucre erect GXAPHALIUM 78 



Involucre radiate HELICHRVSUM. 83 



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



g Scales dry, fadeless. Pappus of scale-like awns XERANTHKMUM. 84 



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



Flowers all perfect. Pappus of 5 or 6 scales MARSHALLIA. 68 



Pappus of many bristles CARPHEPHORUS. 6 



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



A Flowers yellow. Pappus 2 erectly hispid awns COREOPSIS. 58 



A Flowers whitish, heterocephalous. Anthers yellowish AMBROSIA. 47 



monoecious. Anthers yellow IVA. 46 



all perfect. Anthers black MELAXTHERA. 49 



t Outer scales of the invol. leafy. Pappus none C ARTHAMUS. 94 



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



S Pappus plumous. Achenia obovate CVNARA. 90 



/ Pappus plumous. Achenia oblong CIRSIUM. 97 



} Pappus scabrous, triple, each row by 10's Cxicus. 95 



simple. Scales spinescent, (Corduus, p. 392, or) OXOPORDOX. % 



Scales hooked LAPPA. 98 



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



* Leaves alternate. Receptacle with deep horny cells BALDWIXIA. CS 



Receptacle with shallow fringed cells GAILLARDIA. 63 



Receptacle areolate. Rays all yellow HELLENIUM. 67 



Rays spotted at base t GAZANIA. 64 



I 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 awus or bristles BOLTOXIA. 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 LEUCANTHEMUM. 72 



Invol. hemispherical CHRYSANTHEMUM. 75 



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



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



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



tn Rays 40 200. Involucre scarcely imbricated, scales nearly equal ERIGEROX. 20 



n Flowers dioecious, purplish. Leaves all radical NARDOSMI A. 1 4 



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



Exotic. Scales subequal, keeled. Fruit hairy AGATHEA. 1(5 



Exotic. Scales imbricated, f ppus double CALLISTEPHUS. 21 



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



o Pappus double in both disk and ray flowers CHRYSOPSIS. 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^TA. .'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, <tc. Leaves alternate SENECIO. 87 



Leaves opposite ARNICA. 8rf 



Shrubby. Pappus 4-toothed, obscure BORRICHIA. 36 



j Herbaceous. Scales (the 4 outer) united iuto u cup TKTRAGONOTIIKCA. 52 



