352 ORDER LXVIII. COMPOSITE. 



Sub-order I.— TUBULIFLO'ILE. 

 Perfect flowers tubular, usually regularly 5-cleft. 



Tribe L— VERNONIA'CEiE. 



Flowers discoid. Style divided, with the branches elon- 

 gated, subulate, hispid. Corolla 5-cleft, regular, or with the 

 limb somewhat palmately divided or bilabiate. Flowers bLue 

 or purple. 



Genus I.— VERNO'NIA. Schreb. 

 (In honor of Win. Vernon.) 



Involucre ovate, imbricate. Florets all perfect and tubular. 

 Receptacle naked. Stigma bifid ; pappus mostly double, the 

 exterior chaffy, the interior capillary. Flowers purple. 



1. V. OLiGorHYL'LA, (Mich.) Stem erect, simple, branching toward 

 the summit, pubescent, scabrous. Radical leaves oval, coarsely den- 

 tate, acute ; cauline ones crowded toward the base, scattered toward 

 the summit, toothed or serrate, scabrous above, pubescent beneath. 

 Flowers in paniculate corymbs.) scales of the involucre ciliate, pubes- 

 cent, ovat. -lanceolate. Seeds oblong, hairy. — Purple. If. June — 

 July. Damp pine-barrens. 2 — 3 feet. Black-root. 



2. V. BCABKb'uima, (Nutt.) Stem simple, slender, pubescent toward 

 the base, nearly glabrous toward the summit. Leaves crowded on the 

 lower part of the Btem, sessile, linear-lanceolate, scabrous, and hairy on 

 both surfaces; margins revolute, denticulate. Flowers in terminal co- 

 rymbs; involuerum with lanceolate, ciliate scales, with a subulate point. 

 Seeds striate, hairy. — Purple. 2f . June — Aug. Pine-barrens. 2 — 3 

 feet. 



3. V. angustifo'lia, (Mich.) Stem simple, erect, scabrous. Leaves 

 long-linear, numerous, entire, or slightly denticulate; margins revolute, 

 pubescent beneath. Flowers in terminal corymbs ; involucre with 

 ovate, Lanceolate scales, terminated by a subulate point. Seeds striate, 

 hairy. — Purple. If. June — Aug. Common. 3 — i feet. 



4. V. Noveboracen'sis, (Willd.) Ste?n erect, pubescent, branching 

 toward the summit. Leaves numerous, narrow, lanceolate, long; upper 

 surface glabrous, the lower pubescent. Flowers in large fastigiate co- 

 rymbs ; involucre hemispherical, with ovate-lanceolate scales, terminated 

 by a long subulate point. Seeds striate, somewhat hairy; exterior pap- 

 pus subulate. — Purple. If. July — September. Moist rich lands. 5 

 —10 feet. 



5. V. ioMi:vi"'sA, (Ell.) Stem erect, slender, tomentose toward the 

 summit. Leaves d arrow- lanceolate, long, acutely serrate; upper sur- 

 face scabrous, lower tomentose. Flowers in fastigiate corymbs ; invo- 

 lucre with ovate-lanceolate scales, with a long filiform point, hairy. — 

 Purple. U- July — August. Wet soils. 8 — G feet. 



6. V. niiKAL'TA. Stem erect, angled, branching toward the summit, 

 pubescent. Leavee numerous, lanceolate-serrate, somewhat scabrous, 

 pubescent beneath. Flowers in fastigiate corymbs; involucre with 

 ovate, acute scales, unarmed —Purple. 2f. Aug. Upper districts of 

 Car. and Geo. 4 — 8 feet. 



