OEDER 70. COMPOSITE. 437 



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

 base ; branches coryrnbous-fastigiate above ; Ivs. narrowly linear, 1-veined, tho 

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

 plant resembling Solidago tenuifolia in aspect, 1 to 2 f 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. lao?, equal ; Kdrrxo^ pappus.) 

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

 involucre lanceolate-subulate, closely imbricated ; receptacle alveolate, 

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

 bristles. (D Rough-hairy, branching, with alternate Ivs. and loose 

 panicles. 



I. divarica.;tis T. & Gr. Scabrous, with thin, hispid hairs ; Ivs. 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 6' to 3f high. Hds. in a diffuse panicle, invoL 2" long, rays 3'', bright yel- 

 low. Aug. Oct. 



29. PRIONOP'SIS, Nutt. (Gr. xQiav, a saw, oi/'^, 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 ; Ivs. 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. fn-por, diverse, 0-tp^ 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, coryuibously branched, with alternate Ivs. and yel- 

 low flowers. 



H. scabra DC. St. erect, flexuous, striate ; Ivs. oblong-ovate, petiolate, 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 3' long, diminishing upwards, where they are lance-oblong and s<_ 

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

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



31. CtfRYSOP'SIS, Xutt, (Gr. xpvaog, gold, oipig, appearance.) 

 Heads many-flowered ; ray-flowers $ , disk-flowers 5 involucre imbri- 

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

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

 compressed. 2 Hairy herbs, with alternate and entire leaves and yel- 

 low flowers. 



Leaves linear, trrnss-liko ; achenia linear ......................................... Nos. 13 



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



a Outer pappus scale-like .............................. Nos. 4, 5 



a Outer pappus bristle-form ........................... Xos. 6 8 



1 C. graminifolia Xutt. Canescent with long silky hairs; Ivs. linear, erect, 

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



