OBDER 70. COMPOSITE. 153 



III. liA BIATIFLORjE. Corolla of the perfect ttoicert bilabiate, (C.) 

 TRIBE 7, MULISIACEJ2. Style nearly as in Cynareae, the branches obtuse, very convex 



outside, minutely downy at the top ........ No. 114 



A. SUBORDER TUBULIFLOILE. 



| Heads discoid, that is, without rays...(l) 



i Heads radiate, i. ., the outer Sowers ligulate. . .(8) 



1 Receptacle naked, t. t., with no pales or bristles among the flowers. ..CD 

 1 Receptacle chaffy, bearing pales among the flowers. . .(6) 

 1 Receptacle bearing bristles, or deeply alveolate (honey combed)... (7) 

 2 Pappus a circle of 520 chaffy scales... (a) 

 2 Pappus none, or a short, toothed margin... (6) 

 2 Pappus composed of many capillary bristles... (3) 

 3 Leaves opposite. (Heads bomogamous)...(<2) 

 3 Leaves alternate... (4) 



4 Heads homogaraous, flowers all perfect... (c) 

 4 Heads heterogamous, flowers not all perfect... (5) 

 5 Scales herbaceous, often deciduous... (e) 

 5 Scales scarious, persistent, often colored. ..(/) 

 6 Leaves alternate... (#) 

 C Leaves opposite... (A) 



7 Pappus none, or consisting of scales. . .(i) 

 7 Pappus composed of many bristles. . .(j) 



8 Receptacle naked (not chaffy), or (in No. 67) deeply honeycomb-celled. . .(9) 

 8 Receptacle chaffy, with pales among the Bowers... (13) 



9 Pappus of 512 scales, which are 1-awned or (in No. 62) cleft-bristly. ..(*> 

 9 Pappus none, or of a few short awns. . .( O 

 9 Pappus of many capillary bristles... (10) 

 10 Rays cyanic, in a single row. . .(HI) 

 10 Rays cyanic, in several rows...(n) 

 10 Rays yellow, in about one row. . .(11) 



11 Pappus double, or of very unequal bristles... (.0) 

 11 Pappus simple, the bristles all similar. . .(12) 



12 Involucre scales imbricated, the outer shorter. ..(p) 

 12 Involucre scales equal, not imbricated... (r) 

 13 Disk and ray flowers both fertile, the latter pistillate. . .(14) 

 13 Disk flowers sterile, ray flowers fertile... () 

 13 Disk Bowers fertile, ray flowers sterile... (15) 

 14 Rays yellow .'..() 

 14 Rays cyanic... (0 



15 Achenia obcompressed, often beaked... (c) 



15 Achenia compressed laterally, or not at all...(z) 



a Corolla lobes one-sided. Head large, many-flowered STOKESIA. * 



Corolla lobes one-sided. Heads 4-^5-flowered, aggregated ELEPHA.VTOPUS 3 



a Corolla lobes equal. Leaves opposite. Pappus awned AGERATUM. 4 



Leaves whorled. Pappus obtuse .... SCLEROLKPIS. 5 



Leaves alternate. Pappus scales 8 10 PALAFOXI.I. 65 



Pappus scales 1220 HTMENOPAPPUS. 66 



b Leaves opposite. Flowers dioecious, obscure AMBROSIA. 47 



ft Leaves alternate. Flowers yellow. Disk conical M ATRICARI i. 73 



Flowers yellow. Disk convex TANACETUM. 74 



Flowers whitish. Erect, leafless above ADENOITIOIXW. 15 



Fls. 8.... ARTEMISIA. 76 Fla. C ....HUMKA. (82 a) 110 



Low and depressed... SOLIVA. 77 



e Scales of the involucre in one row. Flowers cyanic CACALIA 88 



Flowers yellow. Receptacle flat SKSKCIO 87 



Receptacle convex RUGELIA 8S 



e Sock* imbricated. Flowers yellow (No. 8,or) BIGELOYII 27 



Flowers whitish EUPATOKIUM, 10, and KUHXIA. 8 



Flowers purple. Pappus simple. Involucre not radiate... LIATRIS. 7 



Pappus simple. Involucre dry, radiate. ..RIIODANTHK. 82 

 Pappus double VKRNONIA. 1 



