3^4 



ORDER LXVin. COMPOSITE. 



base, 3-lobed. Achenia elliptic, winged; pappus 2 short awns; disk 

 dark purple. — Yellow. June — Sept. Pine-barrens. N. C, Florida, and 

 Texas. 1—3 feet. 



13. C. tenuifo'lia, (Ehr.) (C. verticillata, L.) >S<e?n glabrous, slightly- 

 angled, branching toward the summit. Leaves trifoliate, sessile ; leaf- 

 lets many-parted, with linear, entire segments. Flowers in corynibs; 

 exterior involucre with about 8 lanceolate leaves. — Ytllow. If. July 

 — Aug. Upper Car. 2 — 3 feet. 



14. C. trichosper'ma, (Mich.) Stent glabrous, branching, angular. 

 Leaves opposite, pinnate ; leaflets serrate. F/o?f(?rs in corymbs; exte- 

 rior involucre with 8 ciliate leaves ; ray florets 8, entire ; chaff linear-lan- 

 ceolate. — Yellow. U' Aug. — Oct. Swamps. Upper Car. 2 — 3 feet. 



Tickseed. Sunjlower. 



15. C. mi'tis, (Mich.) {O. Aurea, AM.) >S;em obtusely angled, glabrous, 

 much branched. Leaves decussate, bi|>innatifid ; segments linear seiru- 

 late, slightly scabrous. Flowers in terminal panicles; exterior involu- 

 cre with serrulate, linear leaves; interior pubescent at the base ; ray 

 florets 8, obovate. — Yellow. 71. Aug. — Sept. Wet grounds. 3 — 4 

 feet. 



16. C. arista'ta, (Mich.) Stern pubescent. Leaves quinnale ; leaflets 

 pinnate, serrate. Flowers large ; florets of the ray entire, broad, ovaL 

 Seed cuneate, obovate, 2-awned ; awns very long, divaricate. — Yellow 

 "U . Aug. — Sept. 



17. C. PUBEs'cEXs, (Ell.) Stem pubescent, obtusely angled, sparingly 

 blanched. Leaves quinnate, pinnate ; leaflets lanceolate, obtuse, entire 

 the lateral ones small. Floivers terminal, on long branches ; exterior 

 involucre about equal to the interior ; ray florets 8, broader at the sum- 

 mit. /Se^c/ slightly winged. — Yellow. U- Aug. — Sept. Western Geo. 

 2—3 feet. 



18. C. trip'teris, (L.) SteJ7i glabrous, branching toward the summit, 

 fistular. Leaves opposite, the upper ones trifoliate ; leaflets lanceolate, 

 glabrous, entire, scabrous along the margin ; radical leaves pinnate ; ex- 

 terior involucre not as long as the interior ; ray florets entire, 8. Seed 

 slightly winged.— ^Yellow. If. Aug. — Oct. Western Geo. 4 — 6 ft. 



19. C. nuda'ta, (Nutt.) Ste7n erect, glabrous, striate, dichotomously 

 divided toward the summit. Leaves subulate, linear, glabrous, those 

 near the summit smaller. Flowers terminal ; exterior involucre minute. 

 —Red. U- July— Aug. Southern Geo. 2—3 feet. 



c. Leaves alternate. 



20. C. gladia'ta, (Walt.) Ste?n glabrous, striate, dichotomously di- 

 vided toward the summit. Leaves narrow, lanceolate, entire, succu 

 lent ; radical ones on long petioles. Flowers terminal ; exterior invo- 

 lucre smaller than the interior, expanding; ray florets 3 lobed at the 

 summit, 8. Seed with serrulate wings ; pappus pilose ; chaff purple.— 

 Yellow. If , Aug. — Sept. Damp pine-barrens. 2 — 3 feet 



