COMPOSITAE 201 



Leaves ovate, dentate. 1. B.purpurea. 



Leaves lanceolate, entire. 2. B. pallida. 



1. B. purpurea (L.) Britton. 2-5 high, somewhat rough : leaves 5- 

 nerved, rounded at base, rough : rays rich crimson, IS^-SO" long. In 

 dry woods near Grain Valley. Rare and local. June-September. 



2. B. pallida (Nutt.) Britton. 2-3 high, rough-hispid: leaves 3- 

 nerved, attenuate at base, rough : rays pale crimson, 15 // -24 // long. On 

 dry prairies throughout the southern part. Often abundant. May-July. 



27. HELIANTHUS L. SUN-FLOWER. 



Stout herbs with long-peduncled heads of yellow flowers. Involucral 

 bracts in several rows. Ray flowers neutral. Disk flowers fertile. Pap- 

 pus of two deciduous awns. 



Leaves long-linear or filiform. 1. H. orgyalis. 



Leaves prevailingly lanceolate. 



Stems hispid. 2. H. Maximiliani. 



Stems glabrous. 3. H. grosse-serratus. 



Leaves prevailingly ovate to ovate-lanceolate. 

 Leaves mostly opposite. 



Leaves cordate-clasping at base. 4. H. mollis. 



Leaves petioled. 



Leaves tapering at base. 5. H. scaberrimus. 



Leaves rounded at base. 6. H. hirsutus. 



Leaves mostly alternate. 

 Annuals. 



Involucral bracts lanceolate. 7. H. petiolaris. 



Involucral bracts ovate. 8. H. annuus. 



Perennial. 9. H. tuberosus. 



1. H. orgyalis DC. 2-10 high, glabrous and glaucous, very leafy : 

 heads numerous, !' broad : involucral scales loose and spreading. Very 

 abundant loc.illy on high prairies and open hillsides from Dodson (rare) 

 to Hickman's Mills and south west ward. August-September. 



2. H. Maximiliani Schrad. 3-12 high : leaves nearly entire, almost 

 sessile : involucral scales loose, strigose-pubescent. Frequently adven- 

 tized along railroads, especially at Kansas City. July-September. 



3. H. grosse-serratus Martens. 2-15 high : leaves slender-petioled, 

 serrate, rough above, more or less canescent beneath : involucral scales 

 loose, ciliate. Common, especially along prairie rills in the southern part. 

 July-October. 



4. H. mollis Lam. 2-5 high, densely hispid : leaves serrulate, sca- 

 brous above, finely pubescent beneath : involucral scales loose, soft-pubes- 

 cent. Occurs locally in barrens near Lee's Summit and Dodson ; also 

 occasionally adventized in waste places. July-October. 



5. H scaberrimus Ell. l-4 high, scabrous : leaves petioled, serrate, 

 thick, rough on both sides : iuvolucral scales appressed. Common on dry 

 prairies in the southern part ; also occasionally adventized along railroads. 

 August-September. 



