166 ORDER 70. COMPOSITE. 



hemispherical, of equal scales. Recep. subalveolate, conical. Pap. iione. 

 @ U Heads solitary. 



1 If. integrlfolla MX. Annual, diffusely branched ; Ivs. entire, spatulate-obov&te to 



lance-obi. ; sc. with scarious margins ; rays violet-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. U Splendid Mexican herbs. Leaves opposite, pinnate. 



I>. VARIACILIS. Lfts. ovate, acuminate, coarsely serrate, 37 in number ; stems stout, 

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

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

 has the heads from H to 2' broad. 



24. BOLTONIA, L'Her. Ray-flowers 2 , in a single series, those of the 

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

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



3 (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 setie, no awns. Swamps, Pa. to Ga. 1 3f. Rays 13 20. 



'i B. glastifolia 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. decurrens. 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. III. (J. Wolf.) (B. glastifolia. /3. ? T. & G.) 



i B. difl'usa Ell. Lvs. lance-linear to subulate, entire ; hds. small, in a diffuse panicle ; 

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



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

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

 Bolidago. 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, 2 , remote ; 

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

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

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

 with 115 (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. CHUYSOMA No 1 



$ Herbs. Scales of involucre with spreading herbaceous tips. CBRYSASTRUM . . N< 9. 24 

 | Herbs. Scales imbricated, erect, scarious, seldom herbaceous., .(a) 



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



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



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



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



