ORDER LXVIII. — COMPOSITE. 393 



branched at the base. Leaves opposite, oblong ; the lower ones alter- 

 nate at the base, hirsute. Flowers terminal; involucre glabrous; ray 

 florets toothed, about 8. — Yellow. 2f. June — July. Pine-barrens. 

 Common. 1 — 2 feet. 



3. C. latifo'lia, (Mich.) Stem glabrous, smooth. Leaves opposite, 

 undivided, ovate or ovate-oblong, dentate or serrate ; teeth mucronate. 

 Heads in corymbs ; scales of the involucre linear, the outer spreading; 

 rays large, 5 — 6. — Yellow. Aug. Mountains. 4 — 6 feet. 



4. C. argu'ta, (Pursh.) Stem glabrous. Leaves lanceolate-ovate, acu- 

 minate, serrate. Flowers on axillary and terminal peduncles, dichoto- 

 mously divided. — Yellow. 2f . Carolina. 



5. C. GEmle'ri, (Ell.) (C integrifolia, Poir.) Stem glabrous, angular. 

 Leaves sessile, glabrous, acute at each end, clasping, and somewhat 

 connate. Flowers opposite, axillary ; the upper ones in corymbs; the 

 exterior involucre smaller than the interior ; ray florets about 8, entire. 

 Seeds compressed, margined. — Yellow. 2f. July — Aug. Upper Car. 



6. C. rose'a, (Nutt.) Stem glabrous, simple or branching. Leaves 

 opposite, connate, linear, entire. Flowers on axillary and terminal pe- 

 duncles ; exterior involucre small; ray florets about 8. Seed entire. — 

 Pale red. If. Aug. — Sept. In damp pine-barrens. Common. 10 — 

 12 inches. 



b. Leaves opposite, divided 



7. C. auricula'ta, (L.) Stem pubescent or nearly glabrous. Leaves 

 sessile, entire, oblong-lanceolate, finely pubescent, the lower ones di- 

 vided, with 2 small lateral lobes at the base. Flowers axillary and 

 terminal; exterior involucre equal to the interior; ray florets about 8, 

 toothed.— Yellow. If" Aug.— Oct. 3—4 feet. 



8. C. diversifo'lia, (Ell.) Stem pubescent, dichotomously divided. 

 Lower leaves trifoliate, the leaflets obovate or nearly orbicular ; the 

 upper ones spatulate-lanceolate, all entire, sprinkled with glandular 

 hairs. Flowers on long peduncles ; exterior involucre equal to the inte- 

 rior. Seed nearly round. — Yellow. If. May — July. Middle Car. 

 and Geo. 



9. C. senifo'lia, (Mich.) Stem pubescent, branching toward the sum- 

 mit, angled. Leaves sessile, opposite, trifoliate ; leaflets pubescent, lan- 

 ceolate. Floivers in terminal corymbs ; exterior involucre equal to the 

 interior, both pubescent ; ray florets pubescent on the outer surface, 

 about 8. — Yellow. If. June — Aug. Pine lauds. 2 — 3 feet. 



10. C. tincto'ria, (Nutt.) Stem glabrous. Leaves opposite, pinnately 

 divided; lobes linear, entire; rays 3-lobed, twice the length of the in- 

 volucre. Achenia oblong, wingless. A cultivated plant. — Yellow and 

 purple. July — Oct. Lou. and Texas. 1 — 3 feet. 



11. C.verticilla'ta, (Ehr.) (C. del phinifoli a, Lam.) Stem erect, angled 

 striate, glabrous, branching near the summit. Leaves opposite, trifoliate, 

 sessile; middle leaflet frequently 3-parted ; leaflets linear-lanceolate, 

 entire. Flowers in corymbs ; exterior involucre usually 10-leaved, in- 

 terior 8 ; ray florets 8. Seed compressed ; chaff filiform, dilated at the 

 summit. — Yellow. 2f . June — Aug. Dry soils. 2 — 3 feet. 



12. C. angustifo'lia, (Ait.) Stem simple, corymbose at the summit, 

 glabrous, angled, slender. Leaves entire, opposite or alternate, linear 

 or lanceolate, narrowed toward the base ; rays obovate, tapering at the 



17* 



