OKDKU 70. COMPOSITE. 17] 



31. CONYZA, L. GNATBANE. Fls. all tubular, those of the margin $ , 

 of the centre $ or 9 . Scales in several rows. Recep. flat or convex. Gyp 

 compressed. Pap. I row of (red) capil. bristles. Herbs chiefly trop. Fls. yel 



C. ambigua DC. Cinereous-pubescent; lower Ivs. sinuate-lobed, acute, middle re- 

 pand-deutate, upper linear, entire ; hd?. panicled. Ga. S. Car. Ap.-Jl. (C. sinuata Ell.) 



32. INUIiA, L. ELECAMPANE. Hds. many-flowered. Invol. imbricate. 

 Ray-fls. numerous, ? ; disk-fls. 5 . Recep. naked. Pap. simple, scabrous. 

 Anthers with 2 bristles at base. U Coarse European herbs, with alternate 

 leaves and veiy large yellow heads. 



I. Hcleiilum L. Lvs. amplexicaul, ovate, rugous, downy beneath ; hds. solitary, ter- 

 minal ; sc. ovate. Pastures and roadsides, N. Eng. to 111. 4-6f. Root Ivs. l-3f. Jl. Aug. J 



33. PLUCHEA, DC. MARSH FLEABANE. Hds. oo-flowcred ; fls. of 

 the margin 9 , of the centre 5 , but sterile. Invol. imbricated. Recep. flat, 

 naked. Sty. undivided. Pap. capillary, simple. Strong-scented herbs, with 

 alternate leaves and corymbs of purple fls., and copious, reddish pappus. 



1 P. bi fro iis DC. Pubescent, leafy; Ivs. oval-oblong, acute, finely serrate, cordate- 



amplexicaul, veiny ; heads in compound, corymbous clusters, y Damp, S. 2f. 



2 P. camphorikta DC. Lvs. ovate-lanceolate, somewhat pubescent, acute, sessile or 



short-petioled, serrate ; fls. in crowded corymbs ; sc. viscid-downy, pointed. (T) Salt 

 marshes. Mass, to Fla. 1 3f. Stout, some fleshy, with upright branches. Aug. Sept. 



3 P. purpurascens DC. Glandnlar-tomentons ; Ivs. ovate-lanceolate, serrate, on 



slender petioles ; hds. on slender ped. ; sc. downy, acute. Swamps. l-2f. Fla. Sept. 



4 P. fcettda DC. Nearly glabrous, very leafy ; Ivs. broadly lanceolate, acute or acu- 



minate at each end, petiolate, obtusely subserrate ; heads numerous, in paniculate 

 corymbs ; scales smoothish, acute, li Open hills, W. & S. 1 2f. Aug. Oct. 



34. BACCHARIS, L. GROUNDSEL TREE. Hds.. discoid, S $ . Invol. 

 imbricate, cylindric, or ovate, with subcoriaceous, ovate scales. $ Sta. 

 exserted. Recep. naked. Pap. capillary. 5 With alternate leaves and 

 white flowers in Autumn. 



1 If. lialimlfolla L. Whitish-scurfy ; Ivs. obovate. incisely- or repand-dentate above, 



the highest lanceolate; panicle compound, leafy ; fascicles pedunculate, terminal, in 

 a dense panicle. Sea-coast, Conn, to Fla. 6 12f. A handsome shrub. 



2 B. glomerullflora Pers. Minutely scurfy ; Ivs. all obovate, very obtuse, repand- 



few-toothed ; heads in sessile, axillary glomerules. Coast, Va. to La. 3 6f. 



3 If. angustltolla MX. Diffusely branched; Ivs. linear, sessile, entire; hds. small, 



15-20- flowered, cylindrical, axillary, loosely paniculate. Marshes, 8. 6 lOf. 



35. PTEROCAULON, Ell. BLACK-ROOT. Hds. many-flowered, the 

 fertile flowers $ , in several rows, the sterile flowers central, mostly 5 . Sc. 

 imbricated, caducous with the fruit, ? corollas 3-toothed, 5 5-cleft. Cyp 

 angular, hispid. Pap. of equal capillary bristles longer than the involucre 

 U Rhizome tuberous. Leaves alternate, decurrent, and the stem w'nged 

 Heads sessile, crowded in a thick woolly spike. 



I*, pyclinostacliyum Ell. Simple; Ivs. lanceolate, smooth above, cream-white 

 tomentous beneath, as well as one side of the wings of the stem. Sandy soils, S. 2-3f 

 Spike 2 3'. May Aug. A curious plant. 



36. BORRICHIA, Adans. SKA OX-EYE. Ray-fls. ligulate, 5, ftrtilc 



