226 COMPOSITE. (COMPOSITE FAMILY.) 



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

 small, corymbose-panicled ; rays white ; outer pappus short and chaffy. Dry 

 old fields, common. June. Stem 2 high. 



Var. Beyrichii, Gray. Biennial, puberuleut; stems slender, l-2 

 high ; leaves mostly entire, the lowest clustered, li near-spat ulate, long-peti- 

 oled, the upper sessile ; heads small ; rays rose-color. Sandy pine barrens, 

 South Carolina, and westward. May. 



2. E. annuus, Pers. Annual, hirsute, erect (2 -4 high); lowest 

 leaves oblong, petioled, toothed, the upper lanceolate, sessile, mostly entire ; 

 heads corymbose ; rays white, not twice the length of the sparsely hirsute 

 involucre ; inner pappus of the ray dowers scanty or none. Waste places. 

 May - June. 



3. E. Philadelphicus, 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. Low ground. 

 May. Stem 2 -4 high. 



4. E. quercifolillS, Lam. Resembles the preceding, but less hairy; 

 lower leaves mostly sinuate-pinnatifiil ; heads smaller, and rays shorter. 

 Low ground, South Carolina, and westward. 



-i- -i- Hays less numerous, linear. 



5. E. bellidifolius, Mnhl. Hairy or villous; stem simple ; lowest leaves 

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

 entire ; heads large, solitary or corymbose ; rays broadly linear, bluish purple. 

 Open woods and banks in the upper districts. March -April. Stem 1 

 high, stoloniferous. 



6. E. nudiculis, Michx. Smooth or nearly so ; stem simple, scape-like ; 

 radical leaves clustered, thick, spatulate or obovate, entire or slightly toothed ; 

 the others small and remote ; heads corymbed ; rays (about 30) white. Pine- 

 barren swamps. March - April. Rhizoma thick. Stem 1 - 2 high. 



* Annual: rays shorter than the disk. 



7. E. Canadensis, L. Hirsute or smoothish; stem much branched; 

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

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

 Sept. Stem l-3 high. 



8. E. divaricatus, Michx. Annual, decumbent, hirsute; leaves nnr 

 row-linear; heads loosely corymbose; rays purple, not longer than the simp'e 

 pappus; achenium nearly smooth. Mississippi, Tennessee, and northward 



9. E. linifolius, "Willd. Stem erect, 1- 4 high, simple or brand. e 1 ; 

 lowest leaves oblong, coarsely toothed, the upper linear, entire ; heads pani- 

 c-led ; flowers 5-toothed. Waste places. Introduced. 



18. BOLTONIA, L'Her. 



Heads many-flowered. Rays pistillate. Scales of the hemispherical invo- 

 lucre imbricated in two rows, not longer than the disk. Receptacle hemi- 

 spherical or conical, obscurely alveolate. Acheuia flattened, obovate, wing- 



