ORDEB 70. COMPOSITE. 409 



e Shrubs. Flower dioecious, the ? and i in different heads BACCHARIS. 35 



e Herbs. Stein winged. Heads spicato PTEROCAULON. 86 



Stem wingless. Heads corymbous, purplish PLUCIIEA. 34 



Heads paniculate. Pappus reddish CONYZA. 32 



Pappus white EKRCIITITES. 83 



f Receptacle chaffy except in the center FILAOO. 80 



f Receptacle naked. Heads dioecious ANTENNARIA. 79 



Heads heterogamous. Involucre erect GNAPHALIUM. 73 



Involucre radiate HELICIIU YSUM. 8'J 



g Scales dry, fadeless. Pappus of scale-like awns XEBANTUEMUM. 81 



g Scales herbaceous. Flowers heterocephalous. Fruit a burr XANTIIIUM. 4 



Fls. all perfect. Pappus of 5 or 6 scales MAKSHALLIA. 63 



Papp. of many bristles C ABPHEPHORUS. ft 



h Flowers yellow. Pappus 2 inversely hispid awns BIDENS. 5S 



h Flowers yellow. Pappus 2 erectly hispid awns COREOPSIS. 57 



h Flowers whitish, heterocephalous. Anthers yellowish AMBROSIA. 45 



moncecious. Anthers yellow IVA. 44 



all perfect Anthers black MEL ANTIJERA. 47 



i Outer scales of the in vol. leafy. Pappus none CARTIIAMUS. 98 



i Outer scales pectinate or ciliate-fringed CENTAUREA. 91 



i Outer and inner scales obtuse, entire AMBERBOA. 92 



j Pappus plumous. Achenia obovate CTNARA. 88 



J Pappus plumous. Achenia oblong CIRSICM. 90 



j Pappus scabrous, triple, each row by 10s CNICUS. 94 



simple. Scales spinescent ONOPORDON. 95 



Scales hooked LAPPA. 97 



k Leaves opposite. Papp. scales deeply cleft into bristles DYSODIA. 61 



k Leaves alternate. Rays fertile HELENIUM. 65 



Rays sterile. Receptacle naked or flmbriate GAILLARDIA. 62 



Receptacle areolate, LEPTOPODA. 66 



Receptacle deeply-celled BALDWINIA. 67 



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



1 Leaves opposite. Involucre single ; scales united TAGETES. 89 



1 Leaves alternate. Pappus of a few short awns or bristles BOLTONI A. 24 



Pappus a membranous margin MATRICARIA. 73 



Pappus 0. Rays fertile, disk sterile CALENDULA. 90 



Fls. all fort. Invol. scales equal BELLIS. 22 



Invol. broad, flat LEUCANTHEMUM. 72 



Invol. hemispherical CHRYSANTHEMUM. 74 



m Rays neutral sterile, 312 ; Pappus simple GALATELLA. 10 



m Rays pistillate, fertile, about 5. Achenia very silky SEBICOCARPUS. 17 



S 12. Pappus double DIPLOPAPPOT. 19 



5 75. Pappus simple ASTER. 15 



1C 200, white. Scales equal ERIGEBON. 2 



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



U Fls. all fertile. Outer pappus or very short bristles EKIGEROX. 211 



Outer pappus a crown of short, pointed scales CALLISTEPIIUS. 21 



O Flowers of the disk mostly sterile. Rays 30 10 PRIONOPSIS. 2!> 



O Fls. all fertile. Pappus double in the disk, none in the ray HETEROTHECA. ?>() 



Pappus double in both disk and ray CHRYSOPSIS. 31 



p Heads large, about 20-rayed. Pappus in one row INULA. S."> 



p Heads very small, 1 15-rayed. Pappus 1 row, shorter than achenia. . .ISRACHYCII.STA. 25 

 Pappus 1 row, tawny, longer than achenia..IsopApPU8. 28 



Pappus irregularly 2-rowed, white SOLIDAGO. 26 



r Head solitary, on a scape with alternate bracts TUSSILAGO. 1-" 



r Heads corymbed, &c. Leaves alternate SENECIO. 86 



Leaves opposite ARNICA. 87 



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



8 Herbaceous. Scales (the 4 outer) united into a cup TETKAGONOTHECA. 50 



Scales distinct. Achenia 4-angled. Pappus HEUOPSIS. 49 



Achenia flattened. Pappus ACMBLJ.A. 59 



Ach. flat, with a 2-awned pappus VKBBESINA. CD 



