ORDER Lxvm. COMPOSITE. 369 



lanceolate, fringed ; ray florets linear-lanceolate, S-cleft. Seed oblong, 

 villous; pappus double, consisting of long and short hairs. — Pale pur- 

 ple and yellow. 2f . Sept. — Oct. Dry soils. Common. 



2. D. dichot'omus, (Hook.) Stem pubescent, dichotomously divided 

 toward the summit. Leaves sessile, oblong-oval, obtuse, pubescent. 

 Flowers in corymbs, on long, naked peduncles ; involucre with linear- 

 laneeolate scales, pubescent, short. Seeds hairy ; pappus double. — 

 "White, tinged with purple. 2f . Oct. On the sea-coast. 2 feet. 



3. D. cornifo'lius, (Darl.) (Chrysopsis humilis, Xutt.) Stem erect, 

 pubescent. Leaves lanceolate or somewhat rhomboidal, acuminate, gla- 

 brous, hispid along the margin and veins. Flowers in dichotomous co- 

 rymbs ; involucre with lanceolate, hairy scales ; ray florets generally 

 8. Seeds glabrous. — White, 2f . Sept. — Oct. Mountains. 1 — 2 feet. 



4. D. amygpali'nus, (T. & G.) {Chrysopsis amygdalina, Nutt.) Stem 

 striate, simple, branching, and finely pubescent toward the summit. 

 Leaves lanceolate, acuminate, slightly pubescent, and scabrous on the 

 upper surface. Flowers in terminal corymbs ; involucre with short, 

 lanceolate, pubescent scales; ray florets generally 12, narrow. Seeds 

 pubescent. — White. 2f. Aug. — Sept. On the borders of swamps. 

 Middle Car. and Geo. 2 feet. 



5. D. obova'tus, (T. & G.) (Chrysopsis obovata, Nutt.) Stem erect, 

 pubescent, somewhat viscid when young, branching toward the sum- 

 mit. Leaves sessile, oval, mueronate, tomentose beneath, somewhat ru- 

 gose. Flowers in paniculate corymbs; involucre with short, appressed 

 scales; ray florets 10 — 13, 3-toothed. Seed hispid. — White. If. May 

 — June. Damp soils. 2 — 3 feet. 



Genus XIX— BOLTO'NIA. L'Her. 

 (In honor of James Bolton.) 



Involucre imbricate ; ray florets numerous, pistillate ; those 

 of the disk perfect. Receptacle conic, dotted. Seeds flat, mar- 

 gined. Pappus awned, with two opposite ones larger than the 

 rest. 



1. B. asteroi'des, (L'Her.) Stem erect, somewhat striate, glabrous. 

 Leaves alternate, sessile, entire, lanceolate, glabrous, with scabrous mar- 

 gins. Flowers in panicles, on long peduncles ; involucre with subulate 

 scales ; ray florets entire, linear ; those of the disk yellow. Seeds com- 

 pressed. — White or reddish. if. Aug. — Sept. On the margins of 

 swamps. Middle Car. and Geo. 1 — 2 feet. 



2. B. glastifo'lia, (L'Her.) Stem erect, branching, slightly angled, 

 glabrous. Leaves long, lanceolate, serrate, acute, with cartilaginous 

 margins; lower ones somewhat toothed. Flowers solitary, on short 

 peduncles; involucre with glabrous, subulate leaves, with the margins 

 slightly serrulate ; ray florets numerous ; those of the disk numerous, 

 yellow. Seeds pubescent, winged, obcordate ; pappus consisting of 

 scabrous bristles, unequal. — White or reddish. If. July — Aug. Mid- 

 dle and Southern Geo. 2 — 3 feet. 



3. B. diffusa. Stem diffusely branched. Leaves lanceolate, sessile, 

 entire ; those of the branches linear, of the branchlets subulate. Ache- 

 nia obovate, narrowly winged ; pappus of several short bristles and 2 



16* 



