624 



COMPOSITAE 



32. Ratibida Raf. 

 1. R. pinnata (Vent.) Barnhart. On dry prairies: western N. Y. 

 to Fla., west to S. Dak., Neb. and La. 



Not uncommon as an escape from cultivation, often wanting. 



33. Helianthus [Vaill.] L. 



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

 Leaves narrow, linear or lanceolate; perennial. 

 Leaves broad, ovate; annual. 

 Disk yellow or yellowish: receptacle convex or rarely conic. 

 Leaves prevailingly lanceolate, 3-8 times as long as broad. 

 Stem scabrous, scabrate or hispid, at least above; 

 leaves sessile or nearly so. 

 Leaves scabrous above, hirsute beneath, flat. 

 Leaves very scabrous on both sides. 



Plant 1-4 m. high; heads numerous; leaves 



mostly alternate. 

 Plant 4-7 dm. high; heads I or 2; leaves, all 

 but the upper, opposite. 

 Stem glabrous; leaves sessile by a truncate base. 

 Stem glabrous; leaves petioled. 

 Leaves prevailingly ovate, ovate-lanceolate or oblong. 

 Leaves sessile or very nearly so. 



Stem glabrous; leaves divaricate. 

 Stem hirsute or hispid; leaves ascending. 

 Leaves obviously petioled. 



Stem puberulent or glabrous. 



Leaves membranous, slender-petioled, sharply 



serrate. 

 Leaves firm, short-petioled, less serrate or 

 entire. 

 Stem hirsute or hispid. 



Leaves rounded or truncate at the base, short 



petioled. 

 Leaves, at least the upper, narrowed at the 

 base. 



1. H. angustifolius. 



2. H. petiolaris. 



3. H. giganleus. 



4. H. Maximiliani. 



5. H. Dalyi. 



6. II. divaricatus. 



7. H. grosseserratus. 



6. H. divaricatus. 

 8. //. mollis. 



9. H. decapetalus. 



10. H. strumosus. 



11. H. hirsutus. 



12. H. tuberosus. 



i. H. angustifolius L. In swamps or low grounds: Long Island, 

 N. Y. to Fla., Ky. and Tex., mainly near the coast. 

 N. Y. Common along the south side of L. I., wanting elsewhere. 

 N. J. Rare in Mercer Co., increasing and common southward, 



especially in the pine-barrens. 

 Pa. Bucks Co. 



Tertiary, common on Beacon Hill, less so elsewhere: Cretaceous, 

 less common: Older Formations, rare and scattered near the " fall 

 line." Not north of the moraine. 168-220 days. About sea level. 



