COMPOSITAE 201 



Leaves ovate, dentate. ]. B. purpurea. 



Leaves lanceolate, entire. 2. B. pallida. 



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

 Berved, rounded at base, rough : rays rich crimson, 12"-20'''' long. — In 

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



2. B. pallida (Nntt.) Britton. 2°-3° high, rongh-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. HELLANTHUS L. Sun-flowke. 

 Stout herbs with long-pednncled heads o£ yellow flowers. Involuoral 

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

 pus of two deciduous awns. 



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

 heads numerous, lY broad : involucral scales loose and spreading. — Very 

 abundant locally on high prairies and open hillsides from Dodson (rare) 

 to Hickman's Mills and southwestward. August-September. 



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

 sessile : involucral scales loose, strigose-pubesoent. — 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 canesoent 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 : involuoral scales appressed. — Common on dry 

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

 August-September. 



