Ordee 70.— COMPOSITE. 437 



B. virgata DC. Smooth in all its parts ; st. virgately branched from near the 

 base ; branches corymbous-fastigiate above ; lvs. narrowly linear, 1-veined, the 

 cauliue linear-spatulate ; scales glutinous. — Swamps, N. J. to Fla. and Tex. A 

 plant resembling Solidago tenuifblia in aspect, 1 to 2f high. Lvs. 2 to 3' by 1 to 

 2", rather firm and somewhat remote. Fls. bright yellow, the scales also yellow- 

 ish. Aug. — Oct. 



28. ISOPAP'PUS, Torr. & Gr. (Gr. Icoc, equal ; Trarnfo?, pappus.). 

 Heads radiate; ray fls. 5 to 12, $ , disk-fls. 10 to 20 Q ; seales of the 

 involucre lanceolate-subulate, closely imbricated ; receptacle alveolate, 

 achenia terete, silky-villous ; pappus a single row of equal capillary 

 bristles. — © Rough-hairy, branching, with alternate lvs. and loose 

 panicles. 



I. divarica..us T. & Gr. Scabrous, with thin, hispid hairs; lvs. linear-lanceolate, 

 taper-pointed at each end, sessile, nearly entire; hds. on slender, naked pedicels; 

 rays about 7, longer than the invol, disk-fls. about 12; scales slender-pointed, 

 shorter than the tawny pappus. — Dry sandy soils, Ga. (Feay) to Fla. and Tex. 

 Plant C to 3f high. Hds. in a diffuse panicle, invol. 2" long, rays 3 ', bright yelr 

 low. Aug. — Oct. 



29. PRIONOP'SIS, Nutt. (Gr. ttqIcov, a saw, uipic, resemblance; 

 alluding to the serrate leaf.) Heads depressed, radiate, many-flowered ; 

 rays in one series, $ , disk lis. £ ; scales imbricate, squarrous ; receptacle 

 alveolate, flat ; ach. glabrous, turgid ; pappus deciduous, of rigid, scab- 

 rous, very unequal bristles, the inner row longer than the corolla.—' 

 Leaves alternate. Fls. showy, yellow. 



P. Chapmanii Torr. & Gr. Hairy or downy, strict, erect ; lvs. erect, smooth, 

 lance-linear, serrate, with remote setaceous teeth ; hds. few ; scales cuspidate. — 

 2[ Swamps in pine barrens, Mid. Fla. (Chapman). Jn., Jl. 



30. HETEROTHE'CA, Cass. (Gr. ZrF.por, diverse, O/jia], envelope.) 

 Heads many-flowered ; rays in one series, ? , disk-flowers y ; scales im- 

 bricated, appressed ; receptacle alveolate, fringed ; achenia minutely 

 canescent, of the ray without pappus (naked), of the disk with a double 

 pappus, the outer very short, scale-like, the inner of capillary bristles. 

 2f. Herbs hairy, corymbously branched, with alternate lvs. and yel- 

 low flowers. 



H. scabra DC. St. erect, flexuous, striate: lvs. oblong-ovate, pet iolate, dentate, 

 •scabrous; petioles abruptly winged as if stipulate at base; hds. large, in a loose, 

 paniculate corymb; rays 15 to 20; pappus tawny-red, the outer white. — A showy 

 plant, in dry soils near the coast, S. Car. to Fla. and Tex. Plant 2 to 3f high. 

 Lvs. 2 to ?>' long, diminishing upwards, where they are lance-oblong and sessile. 

 Tho ray achenia are glabrous, with a minute crown, those of the disk silky. Rays 

 of a rich yellow, expanding 9". Sept., Oct. 



31. CHRYSOP'SIS, Nutt. (Gr. xpvaoq, gold, oxpig, appearance.) 

 Heads many-flowered ; ray-flowers $ , disk-flowers £ ; involucre imbri- 

 cate ; receptacle subalveolatc, flat ; pappus of the ray and disk similar, 

 double, the exterior short, interior copious, capillary ; achenium hairy, 

 compressed. — 21 Hairy herbs, with alternate and entire leaves and yel- 

 low flowers. 



| Loaves linear, jrrass-like •, achenia linear Nos. 1—3 



§ Leaves lance-oblong ; achenia obovate, compressed (a). 



a Outer pappus scale-like Nos. 4.5 



a Outer pappus bristle-form Nos. 6— 6 



1 C. graminifolia Nutt. Canescent with long silky hairs; lvs. linear, erect, 

 entire, grass-like, taperiug to both ends, the upper numerous and reduced to subu- 



