352 OEDER LXVIII. COMPOSITE. 



Sub-order L— TUBULIFLO'R^. 



Perfect flowers tubular, usually regularly 5-cleft. 



Tribe I.— VERNONLi'CE^. 



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. Sclireb. 

 (In honor of Wm. Yernon.) 



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. oLiGorHTL'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 cihate, pubes- 

 cent, ovate-lanceolate. Seeds oblong, hairy. — Purple. 11. June — 

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



2. V. scaber'rima, (jSTutt.) Stem simple, slender, pubescent toward 

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

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

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

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

 ^Ve{^s striate, hairy. — Purple. If. 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. Floicers in terminal corymbs ; involucre with 

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

 hairy. — Purple. If. June— Aug. Common. 3 — 4 feet. 



4. V. NovEBOEACEx'sis, (Willd.) Stem 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, somewliat hairy ; exterior pap- 

 pus subulate. — Purple. 2f. July — September. Moist rich lands. 5 

 —10 feet. 



5. V. TOMENTo'sA, (Ell.) Stem erect, slender, tomentose toward the 

 summit. Leaves narrow-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. 2f . July — August. Wet soils. 3 — 6 feet. 



6. V. pr^kal'ta. Stem erect, angled, branching toward the summit, 

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

 pubescent beneath. Floioers in fastigiate corymbs ; involucre with 

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

 Car. and Geo. 4 — 8 feet. 



