206 coMPOsiT.E. (composite family.) 



Florida to South Carolina. Sept. — Stem 10-3° high. Lowest leaves oval or 

 lauccolatf, tooihod ; those of the branches short and bract-like. Kays blue. 



48. A. exilis, Ell- Very glabrous ; stem slender, tall, sparingly branched ; 

 leaves verv long, linear-subulate ; heads in racemes ; scales of the involucre 

 linear-lanceolate, half as long as the rays. — Damp soil, in the "Western districts 

 of Georgia. Sept. and Oct. — Stem 4° -5° high. Lowest leaves 4' - 6' long, 

 1" wide. Rays pale purple. Achenia jiubescent. 



17. EHIGEROU", L. Fleadaxe. 



Heads mostly hcmisjihcrical, many-flowered. Rays ver}' numerous, pistillate. 



Scales of the involucre nearly equal, in 1-2 rows. Receptacle flat, naked. 



Achenia compressed. Pappus a single row of capillary bristles ; or with an 



outer row of short chaify scales or bristles. — Herbs. Leaves alternate. Rays 



white or jjurplish. 



* Pappus double. 



1. E. strigOSUm, Muhl. Annual, rough-pubescent ; stem slender, coiTm- 

 bose-paniclcd above ; leaves entire or sjiaringly serrate, the lowest oblong, taper- 

 ing into a slender petiole, the upper lanceolate or linear, sessile, distant ; heads 

 small, corymbosc-panicled ; rays white or rose-color ; outer pappus short and 

 chalTy. — Dry old fields, common. June. — Stem 2° high. 



* * Pappus sinrjle. 

 ■f- Annual: rays shorter than the disk. 



2. E. Canadense, L. Hirsute or smoothish : stem much branched ; 

 leaves linear-lanccohitc ; heads very numerous, in panicled racemes, small, cy- 

 lindrical; rays white ; disk-Howers' 4-toothcd. — Old lields, common. May- 

 Sept. — Stem 10-3° liigh. 



■t- -t- Perennial : rays conspicuous. 



3. E. Philadelptiicum, L. Hairy; stem corj-mbose-branched above; 

 leaves tliin, toothed or entire; the lowest spatulate-oblong ; the upper oblong- 

 lanceolate, clasping; rays very numerous and narrow, purplish. (E. quercifo- 

 lium, L'lm., with the lowest leaves pinnatcly toothed.) — Low ground, Florida, 

 and northward. May. — Stem 2° - 4° high. 



4. E. bellidi folium, Muhl. Hairy or villous; stem simple; lowest 

 leaves spatulate or obovate, toothed above tiio middle ; the upper oblong, sessile 

 and entire ; heads large, solitary or corymbose ; rays broadly linear, blui>h-i)ur- 

 ple. — Open woods and banks in the upper districts. March aud April. — Stem 

 1° high, stolonifcrous. 



5. E. vernum, Torr. & Gray. Smooth or nearly so ; stem sim])le, scape- 

 like ; nidical leaves clustered, thick, spatulate or obovate, entire or slightly 

 toothed ; the others small and remote ; heads eorymbed ; rays (alniut SO) white. 

 (E. nndicaule, Mirhx.) — Pine-barren swamps, Florida to North Carolina, and 

 westward. Miinli ;md April. — IJIiiznma thick. Stem 1° -2° high. 



18. DIPLOPAPPUS, Ca.s8. 

 Hciids niiinv flowcri'd. H:iy< S - 12. pi-^tiliiite. Scales of the involucre imbri- 

 cated, without licrbaci'oiis tips. Rrcvptacle flat, alveolate. Pappus of ciipillary 



