COMPOSITAE. 337 



5. RuDBECKiA SPECIOSA Wenderoth. M. p. 987. Moist soil. Avitumu. 



Philadelphki—GeTmantown (Me.), on the Wissahickon (P.). Delaware 

 —Darby (W. Tr.). Chester— (F.). 



6. RuDBECKiA LACINIATA L. M. p. 988. Low thickets. Summer. 



34. HELIANTHUS L. Sunflower. 



Disk purple, purplish or brown; receptacle flat or convex. 



Leaves narrow, linear or lanceolate; perennials. 1. E. angustifolius. 

 Leaves broad, ovate; annuals. 2. E. annuus. 



Disk yellow or yellowish ; receptacle convex or conic. 



Leaves prevailingly lanceolate and 3-8 times as long as wide. 



3. H. giganteus. 

 Leaves prevailingly ovate, ovate-lanceolate or oblong. 

 Leaves sessile or very nearly so. 



Stem glabrous; leaves divaricate. 4. H. divaricatus. 



Stem hirsute or hispid; leaves ascending. 5. H. mollis. 

 Leaves manifestly petioled. 



Stem pubenilent or glabrous. 



Leaves membranous, slender-petioled, sharply serrate. 



6. H. decapetalus. 

 Leaves firmer, shorter-petioled, less serrate or entire. 



Bracts of the involucre much longer than the disk. 



7. H. tracheliifolius. 

 Bracts of the involucre about equalling the disk. 



8. H. strumosus. 

 Stem hirsute, hispid or scabrous. 9. R. tuberosus. 



1. Helianthus angustifolius L. M. p. 991. Low pine-barrens. Autuma. 



BMcfes— Bristol, Tullytown. 



BurliJigton—Atsion (Le.) (Sa.), Quaker Bridge (Pe.) (Sa.). Camden 

 — Winslow, Mart. (B. C), Griffith's Swamp (C). Gloucester — ^eax 

 Mickleton (He.), Swedesboro (Li.). Cumberlaiid—Millville (Je.). At- 

 lantic— Bgg Harbor, Hammonton (Ke.). Ocea?»— Point Pleasant (Br.), 

 Toms River (Ha.) (Wn.), Forked River (U. C. S.) (Wn.). Monmotith- 

 Asbury Park (Br.), Seabright (C). Mercer— Trenton (C). 



New Castle — Townsend, Tatnall and Canby ; Vandyke, Tatnall and 

 Commons. 



2. Helianthus annuus L. Common Sunflower. M. p. 991. Waste places. 



Summer. 



3. Helianthus giganteus L. M. p. 993. Low thickets and swampa. 



Autumn. 



4. Helianthus divaricatus L. M. p. 994. Thickets and barrens. Sum- 



mer. 



5. Helianthus mollis Lam. M. p. 994. Dry, barren soil. Late summer. 



Deiowore— Tinicum (B. Sm.). 



6. Helianthus decapetalus L. M. p. 994. Copses and low banks of 



streams. Late summer. 



7. Helianthus tracheliifolius Mill. M. p. 995. Dry soil. Late summer. 



Buclis — (P.). Delaware — (P.). Northampton — (P.). 



8. Helianthus strumosus L. M. p. 995. Dry woods and banks. Summer. 

 Sa. Helianthus strumosus macrophyllus (Willd.) Britton. M. p. 995. 



Dry woods. Summer. 



