170 ORDER 70. COMPOSITE. 



Recep. pointed by a scale-like cusp. Fr. obconic, hirsute. Pap. bristles in 

 one row. if Glabrous, slender. Leaves alternate, entire. Heads fastigi- 

 ately corymbous, with yellow flowers and colored scales. 

 B. vlrgata DC. Swamps, N. J. to Fla. and La. 1 2f. With virgate branches from 

 base. Lvs. narrowly lin., 1 -veined, the cauline lin.-spatulate. Sc. glutinous. Aug. -Oct. 



28. ISOPAFPUS, T. & G. Ray-fls. 512, $ ; disk-fls. 1020, ? . Scales 

 of the invol. lance-subulate, closely imbricated. Recep. alveolate. Fr. te- 

 rete, silky-villous. Pap. a single row of equal capillary bristles. () Rough- 

 hairy, branching, with alternate leaves and loose panicles. Aug. Oct. 



I. divarica tus T. & G. Scabrous, hispid ; Ivs. lin. -lanceolate, taper-pointed each way ; 

 ped. slender, naked ; rays 6-8, disk-fls. 10-13 ; pappus tawny. Dry. Ga. Fla. to Tex. 



29. HETEROTHECA, Cass. Hds. GO-flowered. Rays in one series, 

 2 ; disk-fls. ? . Scales imbricated, appressed. Recep. alveolate, fringed. 



Fr. minutely canescent, of the ray without pappus (naked), of the disk. with 

 a double pap., the outer very short, scale-like, the inner of capillary bristles. 

 U Hairy, corymbously branched, with alternate leaves and yellow flowers. 

 H. scabra DC. St. flexuous, striate ; Ivs. scabrous, oblong-ovate, dentate ; pet. wing- 

 clasping ; hds. large, rays 15-20 ; pap. tawny red, the outer white. S. 2-3f. Sept. Oct. 



30. CHRYSOPSIS, Nutt. Hds. oo-flowered. Ray-fls. $; disk-fls. $ . 

 Invol. imbricate. Recep. subalveolate, flat. Pap. of the ray and disk simi- 

 lar, double, the exterior short, interior copious, capillary, brownish. Cyp. 

 hairy, compressed, n (g) Hairy, with alternate and entire leaves and yel- 

 low flowers. Heads corymbous. 



Leaves linear and lance-linear, grass-like, veined. Cypsela linear Nos. 1 4 



S Leaves oblong. Cypsela clavellate. a Corymbs simple, umbel-like Nos. 5 7 



a Corymbs compound or paniculate. .No?. 8-lfl 



1 C. gramiuiiolia N. Cane?cent with long, silky hairs ; stem leafy to the top ; Ivs. 



linear, the upper reduced ; hds. many, large, loosely corymhed. Del. to Fla. 2f. Sept. 



2 C. oligaiitlia Chapm. Canescent with silky hairs; st. almost leafless above; hds. 



quite large, lew, on slender peduncles ; Ivs. lance-lin. Damp sands, Fla. 2f. Apr. May. 



3 C. pinifolia Ell. Glabrous ; Ivs. narrowly linear to setaceous, rigid, erect ; hds. soli- 



tary, few ; cyp. villous; pap. reddish-brown, the outer whitish. Hills, Ga. l-2f. Sept. 



4 Cm falfita Eil. Yilious ; Ivs. somewhat falcate, spreading, narrow ; hds. small, in 



axillary corymbs ; rays 3-toothed. Dry sands, Ms. to N. J. St. 8', stout, leafy. Sep. Oct. 



5 & Mariana N. Silky-arachnoid, simple ; Ivs. oblong-lanceolate, smooth when old, 



the lower spatulate, rather obtuse, upper reduced, acute ; hds. about 7, large, 15-20- 

 rayed ; ped. and acute scales glandular. 11 Barrens, N. J. to Fla. 2f. Sept. 



6 C. "OKfcjpina N. Cottony-tomentous, simple; Ivs. uniform, ovate-oblong, ~'tugc, 



the lower tapering to base ; hds. few, large ; ped. short, glandular. @ Md. to Fill, ut 

 barrens. 1 2f. Lower leaves rarely sinuate-toothed. (C. dentata El!.) Sept. 



7 C. villoaa N. Villotis-pubescent, leafy to top; Ivs. acute, low^r oblong-spat ulate, 



tipper oblong-linear, bristly-eiliate ; hds. large, umbel expanded. 111. to Ala. 2f. 



8 C. tricliopliylla N. Silky-villous, branching, leafy; Ivs. oblong to lance-linear, 



the lower obtuse ; corymb large ; ped. and scales smoothish. @ Barrens, S. 2-3f. Sept. 



9 C. scabrella T. & G. Dusty-scabrous, stout, branched ; Ivs. oblong-lanceolate, the 



lower narrowed to base, upper acute ; corymb large; ped. glandular. Fla. 2f. Oct. 



10 . decumbcns Chapm. Silky-villous, decumbent ; Ivs. lance-oblong, obtuse, with 

 leafy axil?, lo\ver spat. -oblong ; hds. very largo, paniculate, glandular. Fla. 3 -If. Nov. 



