Oedbb 70.— TU^ULIFLOR^. 221 



Analysis of the Genera. 



Sub-order First, TUBULIFLOE^, 



having all the perfect flowers tubular (§ 95), the ligulate flowers, if any, imperfect. 



§ Heads of flowers radiate, with y ellowtfay s 2 



§ Heads of flowers radiate, the rays not yellow 3 



§ Heads of flowers discoid (no rays). These genera, about 50 in number, such as 

 the Tansy, Wormwood, Boneset, Ironweed (Mgs. 248-250), Everlasting, Burdodk 

 (Fig. 509), Thistle, Bogweed (Fig. 514), and evjen Bachelor' s-button, are all, for 

 want of room, omitted. (See Class Book of Botany, p. 410, &o.) 



2 Leaves alternate or scattered on the leafy stems 4 



2 Leaves opposite or whorled on the stems, or all radical 6 



3 Leaves alternate or scattered on the leafy stem. . . .7 



3 Leaves opposite or whorled on the leafy stem x 



3 Leaves all radical and the flowers on a scape y 



4 Receptacle chafl'y (with bracts growing among the florets) ... .5 



4 Receptacle with deep, horny cells, like a honeycomb , . . .e 



4 Receptacle not chaffy, flat or merely convex. . . .a 



4 Receptacle not chafl'y, conical or globular i 



5 Rays sterile, disk fertile. Receptacle conical or columnar. . . .g 



5 Rays sterile, disk fertile. Receptacle flattish. Fruit flattened on the sides h 



5 Rays fertile, disk sterile. Receptacle flat. Fruit flattened same way as scales . . . .k 



6 Receptacle chaffy. Rays stSrile, disk fertile o 



6 Receptacle chafl'y. Rays fertile, disk sterile p 



6 Receptacle chaffy. Rays fertile, disk perfect. . . .q 



6 Receptacle naked or destitute of chafl'y scales m 



7 Receptacle not chaffy, naked of scales 8 



7 Receptacle chaffy with scales among the florets. Lvs. finely divided v 



7 Receptacle chaffy with scales, &c. Lvs. undivided, merely toothed.... w 



8 Pappus of numerous bristly hairs 9 



8 -Pappus of 2 or 3 awns and minute hairs. Glabrous plants t 



8 Pappus wholly wanting, or only a membranous margin u 



9 Involucre of unequal scales, imbricated in several rows 10 



9 Involucre scales nearly equal, narrow, and almost in one row.. ..t 



10 Pappus simple, the bristly hairs abundant and about equal r 



10 Pappus double, the outer row of hairs extremely short s 



a Involucre scales imbricated in several rows.'. . .b 



a Involucre not imbri<;ated, the outer scales very short or none Sene'oio. 

 a Invjl. not imbr., outer scales equal to the inner. Marigold. Calbn'dula. 

 a Involucre not imbricated, outer scales longer than inner. S. GArLLAR'mA. 



b Pappus simple, the bristles all equal and of one kind u 



b Pappus double, the outer very short and chaffy. Lvs. entire. W. S. Cheysop'sIs. 



b Pappus double in the disk, none in the rays. Lvs. toothed. S. Hbteeothe'oa. 



