20G COMPOSITE. (composite family.) 



Florida to South Carolina. Sept. — Stem 1° - 3° high. Lowest leaves oval or 

 lanceolate, toothed ; those of the branches short and bract-like. Rays blue. 



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

 leaves very 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, 

 l"wide. Kays pale purple. Achcnia pubescent. 



17. EEIGERON, L. Fleabane. 



Heads mostly hemispherical, many-flowered. Rays very 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 chaffy scales or bristles. — Herbs. Leaves alternate. Rays 



white or purplish. 



* Pappus double. 



1. E. strigosum, Muhl. Annual, rough-pubescent ; stem slender, corym- 

 bose-panicled above ; leaves entire or sparingly serrate, the lowest oblong, taper- 

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

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

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



* * Pappus single. 

 •*- Annual: rays shorter than the disk. 



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

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

 lindrical ; rays white ; disk-flowers 4-toothed. — Old fields, common. May- 

 Sept. — Stem l°-3° high. 



■*- -4- Perennial : rays conspicuous. 



3. E. Philadelphicum, L. Hairy ; stem corymbose-branched above ; 

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

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

 lium, Jjxm., with the lowest leaves pinnately toothed.) — Low ground, Florida, 

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



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

 leaves spatulate <>r obovate, toothed above the middle ; the upper oblong, Bessile 

 and entire; heads large, solitary or corymbose ; rays broadlj linear, bluish-pur- 

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

 1° high, Btoloniferous. 



5. E- vernum, Torr. & Gray. Smooth or nearly so ; stem simple, scape- 

 like; radical leaves clustered, thick, Bpatulate or obovate, entire or slightly 

 toothed ; the others small and remote ; heads corymbed ; rays (about "<>) white. 

 (E. nudicaule, Michx.) - Pine-barren Bwamps, Florida to North Carolina, and 

 westward. March and April. — Rhizoma thick. Stem 1° -2° high. 



18. DIPLOPAPPUS, Cass 

 Beads many-flowered. Rays B-12, pistillate. Scales of the Involucre Imbri- 

 cated, without herbaceoui tip- Receptacle Bat, alveolate. Pappus of capillary 



