Ordee 70.— COMPOSITiE. 437 



B. viTg^ta DC. Smooth in all its parts ; st virgately branched from near the 

 base ; branches oorymbous-faatlgiate above ; Ivs. narrowly linear, l-veined, the 

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

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

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

 ish. Aug. — Oct. 



28. ISOPAP'PUS, Torr. & Gr. (Gr. laog, equal ; rraTrTTOf, pappus.) 

 Heads radiate ; ray fls. 5 to 12, $ , disk-fls. 10 to 20 !^ ; scales of tie. 

 in%'oiucre 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. divaric4v.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., diak-flg. about 12 ; scales slender-pointed, 

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

 Plant 6' to 3f high. Hds. in a diffuse panicle, invol. 2" long, rays 3", bright yeh 

 low. Aug. — Oct. 



29. PRIONOP'SIS, Nutt. (Gr. irpiuv, a saw, &tpig, resemblance ; 

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

 rays in one series, $ , disk fls. ^ ; 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-hnear, serrate, with remote setaceous teeth ; hds. few ; scales cuspidate. — 

 Tl Swampa in pine barrens, Mid. Fla. (Chapman). Jn., Jl. 



30. HETEROTHEXA, Cass. (Gr. erepog, diverse, Oiiict], envelope.) 

 Heads many-flowered ; rays in one series, $ , disk-flowers ^ ; 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. 

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

 low flowers. 



H. soElbra DC. St. erect, flexuous, striate ; lvs. oblong-ovate, petiolate, dentate, 

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

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

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

 Lva a to 3' long, diminishing upwards, where they are lance-oblong and sessile. 

 The ray achenia are glabrous, with a minute crown, those of the disk silky. Raytj 

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



31. CHRYSOP'SIS, Nutt. (Gr. xp^'^^g, gold, oipig, appearance.) 

 Heads many -flowered ; ray-flowers ? , disk-flowers ^ ; involucre imbri- 

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

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

 compressed. — 71 Haify herbs, with alternate and entire leaves and yel- 

 low flowers. 



S Lotives linear, ffrass-Iikft-. achenia linear Nos. 1 — 3 



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



a Outer pappus scale-like Nos. 4. 5 



a Outer pappus bristle-form Nos. 6 — tl 



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

 entire, grass-like, tapering to both ends, the upper numerous and reduced to subiir 



