LXXV. COMPOSITE. 



i Pappus capillary. 

 [ Pappus plumose. . 



Veriwnia. 

 Liatris. 



C Scales much imb ricated. 



( spreading, petaloid. . Hymenopappia. 60 

 ] Scales in 2 series, . . ( erect, greenish. . . Elepliantopus. 2 



Plants 



unarmed. LFls. not all perfect. 



Flowers all perfect, C Scales in l row or series Cacalia. 



( Receptacle S Heads heterogamous. Gntiphalium. 



Scales < not chaffy. ( Heads dioecious. . Antennaria. 



colored. (. Receptacle chaffy Filago. 



( Fls. all \ Invol. imbricated. . Pluchea. 



< equal. ( Invol. calyculate. . Erechtites. 



Scales ^ Herbs. ( Ray flowers larger, sterile. . Centaurea. 



green. ( Shrubby. Heads dioecious. . . . Baccharis. 



( Scales acute- $ Achenia smooth. . . . Cirsium. 



f with spinose < cuspidate. . .( Achenia rugose, 4-angled. . Onopordon. 



I leaves ' Scales emarginate-mucronate Cynara. 



\ ( Heads homogamous. . . . Lappa. 



1 1. Plants armed. I with spinose heads only. (Heads heterocephalous. . . . Xanthium. 



{ Receptacle flat. . Eupatorium. 



( homogamous. < Receptacle conical. Conoclinium. 



{ Heads many, heterocephalus. .... Ambrosia. 



erect. ( Head solitary, terminal Sclerolepis. 



( Stem herbaceous, ( climbing and twining Mikania. 



2. ( Stem shrubby. Heads moncocious Jva. 



$ Heads corymbose. . Tanqpetum. 



( erect. ( Heads racemose. . . Artemisia. 



( dry, (spreading, petaloid, yellow. . Xeranthemum. 



{ green. . Senecio. 



( erect, close, ( yellowish. Bigelovia. 



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



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



alternate. ( Outer corollas enlarged and sterile Amberboa. 



Awns of (He achenja retrorsely hispid Bidens. 



13. I Leaves opposite. (Awns of the achenia upwardly hispid Coreopsis. 



{ Heads small. Solidago. 

 f Involucre 

 I imbricated, 

 ("flat or i Involuc. not 

 1 convex. I imbricated. 



f Receptacle not chaffy, (. conical or globose. 



Pappus simple. (. Hds.very large. In.ula. 

 Pappus double. H'Js. midl. size. Chrysopsia. 

 Outer scales very (uort or 0. . Senecio. 

 Outer scales equa to the inner. Calendula. 

 Ray flowers pistillate. . . Helenium. 



I Ray flowers neutral. . . Leptopoda 



{ Achenia quadrangular. . Rudleckia. 

 (. Pappus minute or 0. \ Achenia compressed. . Lepachys. 

 (Rays < Pappus of 2 caducous awns. Achenia wingless. JMiantftUt, 

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

 Receptacle chaffy. ( Rays fertile. Ach. obcompressed (parallel with the scales). Sitphium. 



t Awns orach, retrorsely hispid. Bidens. 

 { Involucre double, c Awns of ach. erectly hispid. . Coreopsis. 

 f Rays sterile. Involucre imbricate in 3 or more rows, i . . HeHanthus. 



\ Achenia obovoid, thick. . . Polymnia. 



< ( disk sterile. ... Achenia obcompressed, winged. Silphium. 



> Receptacle nearly flat. . . Verbesina. 

 \ Receptacle conical. . . . Heliopsis. 

 Scales 5, united in 1 row. . Tagetes. 

 $ pinnate. ( Sc. in 2 rows, outer row distinct Dysodia. 

 < Lvs. opposite, \ undivided. Scales distinct. . . . Arnica. 

 5. iRecept. not chaffy, i Leaves radical, appearing after the solitary head. . . Tussilago. 



\ Rays white, shorter than scales. Eclipta. 

 $ Receptacle flat. Rays rose color. . . . >. Coreopsis. 

 $ simple. I Receptacle conical, with large pales. . . . Zinnia. 

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



Heads corymbose Nardosmia. 



Head solitary, heferoaramous Bellis. 



$ Achenia silky. Rays about 5. . Sericocarpm. 



(Pappus t copious. \ Achenia smoothish. Rays 6100. Aster. 

 simple, I of 2 short bristles and several minute ones. Boltonia. 

 $ Heads middle size. . . . Diplopappus. 

 Pappus double. ( Heads very large. . . . Callistephus. 

 ( Pappus capillary. Invol. subsimple. Rays 20200. Ertjreron. 



f Receptacle 

 chaft'y. . . (.Rays fertile, ( disk perfect. . . 



6 6. ( Leaves all radical . . 



IT. 



f 



ptacle J 

 hafly, Cs 



Receptacl 



not chaffy, (.smoothish. 



$ Involucre depressed, broad. 

 Pappus none. . . ( Involucre hemispherical. . 

 $ Rays pistillate 



J Disk fls. yellow. ( Rays neutral. 

 fLvs. finely divided. ( Disk fls. white. Rays pistillate. 



43 or 4. 



$ Rays very short, white, ( 5. 

 . Receptacle chaffy. L Leaves undivided. ( Rays very large, purple. . 



\ in 23 rows. 



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

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



Lvs. radical. ( Flowers white ; pappus plumose 



" Pappus single, bristly. 



9 



II 



II 

 I, 

 19 



14 

 13 



Leucanthemum. 4C 



Chrysanthemum A? 



Anthemis. 



Maruta. 33 



Achillea. 39 



Verbesina. 47 



Parthenium. 



Echinacea. 



Troximori. 



Krigia. 



Taraxicum. 



Leontodon. 



Hieracium. 



f Achenia ' Flowers blue. Pappus small, scaly. 



Lvs. unarmed. (Pap. double, outer scaly. Cynthia. 

 Lvs. spinose-dentate ; pappus very white. Son chus. 



;_ Pappus small, scaly Cichori.um. 

 not rost. ( Fls. whitish or cream color. Pap. copious, capillary. Nabalus. 

 ( with a fili- 4 Involucre with calyculate scales. . . Lactuca. 

 Achenia < form beak. ( Involucre without calyculate scales. . Tragopogon. 

 rostrate. ( with a short, thick beak ; involucre imbricate. . . Mulguiium. 



