VASCULAR PLANTS OF NORTH DAKOTA 63 



1 141. Ratibida columnifera pulcherrima (DC.) Woot & 

 Standi 1. c. 



Obeliscaria pulcherrima DC. Prodr. 5: 559. (1836). 

 Leeds, Butte, Bottineau. 

 BRAUNERIA Necker, Elem. I: 17. (1790). 

 Echinacea Moench. Meth. 591. (1794). 



1 142. Brauneria pallida (Nutt.) Britt. Mem Torr Bot. 

 Club 5:333 (1894.) 



Rudbeckia pallida Nutt. Journ. Acad. Phila. 7: 77. (1834). 

 Echinacea angustijolia DC. Prodr. 5: 554 (1836). 

 Narrows, Towner, Leeds. 

 HELIANTHUS Linn. Gen. 11. 979. 



Analytical Key. 



I. Annuals. Disk dark. 



A. Leaves dentate; bracts ovate or obovate, acuminate, hispid- 



ciliate II. annuus 



A. Leaves entire, or almost so; bracts lanceolate, canescent II . petiolaris 



II. Perennials. 



A. Disk dark brown or purple ..H. subrhomboidcus 



A. Disk yellow or light brown. 



B. Leaves lanceolate, 3-8 times as long as wide, acuminate. 

 C. Leaves conduplicate. 



D. Rays 15-30 H. Maximiliani 



D. Besides these, a number of additional ray-like flowers 



emanates from the disk . H. Maximiliani var. iubaris n. var 



C. Leaves flat, subentire or denticulate H. Nultallii 



B. Leaves ovate, ovate-lanceolate or oblong, acute, short- 

 petioled. 

 C. Leaves not verticillate. 



D. Leaves ovate-lanceolate, 2.5 — 3 times longer than 



wide H. apricus 



D. Leaves oblong-ovate, quite large, twice as long as wide. 



E. Leaves smooth beneath ...H. nitidus 



E. Leaves scabrous beneath H nitidus var. camporum 



C. Leaves verticillate in threes H. nitidus var. trifoliatus n. var. 



B. Leaves ovate, acuminate, large, long-petioled, serrate, 

 3.5 — 4 times longer than wide. 



C. Leaves soft-pubescent beneath. ....H. tuberosus 



C. Leaves white-canescent beneath H. tuberosus subcanescens 



1 143. Helianthus annuus Linn. Sp. PI. 904. (1753). 

 Leeds, Bismarck. 



1 144. Helianthus petiolaris Nutt. Journ. Acad. Phila. 2: 

 115. (1821). 



Devils Lake, Pleasant Lake; Denbigh (Bergman). 



