166 ORDER 70. COMPOSITE. 



hemispherical, of equal scales. Recep. subalveolate, conical. Pap. none. 

 (D y Heads solitary. 



1 B. iiitegrifolla MX. Annual, diffusely branched ; Ivs. entire, spatulate-obovate to 



lance-obi. ; sc. with scarious margins ; ray? violut-purp. Ky. to Tex. 6-12'. Mar.-May. 



2 B. PERENNIS. Perennial, acaulescent : root creeping; scape naked, single-flwd. ; Ivs. 



obovate, crenate. Europe. 34'. Fls. white, double, quilled, &c. June Aug. 



23. DAHLIA, L. Rays $ . Disk ? . Invol. double, the outer series 

 of many distinct scales, the inner of 8 scales united at base. Recep. chaffy. 

 Pappus none, if Splendid Mexican herbs. Leaves opposite, pinnate. 



U. VARIA.DILI8. Lfts. ovate, acuminate, coarsely serrate, 3 7 in number ; steins stout, 

 widely branched ; heads solitary, very large ; root tuberous. Colors exceedingly 

 variable and splendid. Heads about 3' diameter ; but a variety (the bouquet Dahlia) 

 hat. the heads from If to 2' broad. 



24. BOLTONIA, L'Her. Ray-flowers ? , in a single series, those of the 

 disk tubular, ? . Scales in 2 series, appressed, with membranous margins. 

 Recep. convex, punctate. Gyp. flat, 2- or 3-winged. Pap. of minute setae, 

 1 (to 4) of them usually lengthened into awns. U Glabrous, loosely branch- 

 ing. Leaves sessile. Rays white. Aug. Oct. 



I B. asteroides L'Her. Lvs. lanceolate, all entire ; heads corymbed; fruit broadly- 

 oval with a few minute setae, no awns. Swamps, Pa. to Qa. 1 3f. Rays 13 20. 



'i B. glastlfolla L'Her. Lvs. linear-lanceolate, the lowest serrate ; heads in a loose 

 paniculate corymb ; fruit obovate, with 2 long awns. Prairies, W. & S. 3 7f. Rays 30. 



3 B. ftecurrens. Lvs. lance-oblong, the broad base decurrent on the green, winged 



stem ; heads corymbed, globular in fruit ; fruit obovate, with 2 awns and several mi- 

 nute bristles ; rays purple. Bottoms. 111. (J. Wolf.) (B. glastifolia. /3. ? T. & G.) 

 i B. diffusa Ell. Lvs. lance-linear to subulate, entire ; hds. email, in a diffuse panicle ; 

 fruit obovate, with 2 short (half its own length) awns. Prairies, W. & S. 3 6f. 



25. BRACHYCH2ETA, T. & G. FALSE GOLDENROD. Pap. a single 

 ow of scale-like bristles, shorter than the obconic cypsela. Otherwise as in 

 Solidago. The golden yellow heads arranged in little clusters, forming 1 or 

 more unilateral racemes. 



B. cordata T. & G. Woods, E. Ky. (at Cumberland Gap) to Ga. along the mountains. 

 2-4f. Lvs. ovate, cordate, the lower petiolate, serrate. Hds. small (3" long). Aug.-Oct. 



26. SOLIDAGO, L. GOLDENROD. Fls. of the ray about 5, $ , remote ; 

 of the disk . Invol. oblong, imbricate, with appressed scales. Recep. 

 punctate, narrow. Pap. simple, capillary, scabrous. H Very abundant in 

 the U. S. Stem erect, branching near the top. Lvs. alternate. Hds. small, 

 with 1 15 (very rarely 0) small rays. Fls. yellow (one species whitish), 

 expanding in the autumnal months. Fig. 319. (Addenda.) 



Shrubs 1 3f. Leaves punctate, veinless, entire. Rays 13. CHBTSOMA No 1 



Herbs. Scales of involucre with spreading herbaceous tips. CHBTSASTBUM.. Ncs. 2--4 

 5 Herbs. Scales imbricated, erect, scarions, seldom herbaceous., .(a) 



a Inflorescence chiefly axillary, in clusters or short racemes.. .(&) 



a Inflorescence terminal, virgate or paniculate... (d) 



a Inflorescence terminal, in a fastigiate corymb.. .() 



6 Rays white or cream- white. Clusters approximate above No. 5 



