170 ORDER 70. COMPOSITE. 



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

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

 ately corymbous, with yellow flowers and colored scales. 



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

 base. Lvs. narrowly lin., 1-veined, the cauline lin.-spatnlate. Sc. glutinous. Atig.-Oct. 



28. ISOPAPFUS, T.&G. Ray-fls. 5 12, 9; disk-fls. 1020,5. 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. dlvaricatns 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. oo-flowered. Rays in one series, 

 $ ; 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 Haiiy, 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, if (2) Hairy, with alternate and entire leaves and yel- 

 low flowers. Heads corymbous. 



Leaves linear and lance-linear, grass-like, veined. Cypsela linear No?. 1 4 



j Leaves oblong. Cypsela clavellate. a Corymbs simple, umbel-like Nos. 57 



a Corymbs compound or paniculate. .Nos. 8-10 



1 C. graminifolia N. Canescent with long, silky hairs ; stem leafy to the top ; Ivs. 



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



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



quite large, few, 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. villons ; pap. reddish-brown, the outer whitish. Hills, Ga. l-2f. Sept. 



4 C. faloata Ell. Villous ; Ivs. somewhat falcate, spreading, narrow ; hds. small, in 



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



5 C. 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. ~n Barrens, N. J. to Fla. 2f. Sept. 



6 C. gossypina N. Cottony-tomentous, simple ; Ivs. uniform, ovate-oblong, ^tuge, 



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

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



7 C. villosa N. Villons-pubescent, leafy to top; Ivs. acute, lowjr oblong-spatulate, 



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



8 C. tric-liophylla 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. Ocl. 



IOC. decumbens Chapm. Silky-villous, decumbent ; Ivs. lance-oblong, obtuse, with 



leafy axils, lower spat.-oblong ; hds. very large, paniculate, glandular. Fla. 3-4f. Nov. 



