VASCULAR PLANTS OF NORTH DAKOTA 37 



C. Terminal head enlarged 5-6 times, having the appearance 



of a cock's comb... 3. L. fallacior var. celosioides var. nov. 



A. Bracts of the cylindric involucre oblong or lanceolate, with 

 recurved spreading, acuminate tips; pappus bristles minutely 



barbellulate 4. L. pychnostachya 



A. Bracts of the hemispheric involucre obtuse; pappus bristles 



barbellulate L. scariosa 



C. Inflorescence containing only one head. 



D. Heads 1.5 cm. diametrically 5. var. uniflora 



D. Heads 2-2.5 cm. diametrically. 6 var. singularis var. nov. 



C. Inflorescense short, with 2-15 heads. 

 D. Heads racemose. 



E. The lower series of leaves occupying only the lowest 



part of the stem, close to the tuber 7. var. basilaris 



E. The lower series of leaves occupying one-third to one- 

 half of that part of the stem reaching from beneath 

 the inflorescence to the tuber. 

 F. The lowest leaves of the lower series overtopping 

 the leaves of the same series higher up on the 

 stem or the lowest or all leaves of the upper series 



8. var. supereminens 

 F. The leaves of the lower series passing very 

 abruptly into the leaves of the upper series, but 

 no leaf reaching above any leaf born higher up 



on the stem 9. var. praeceps 



F. The leaves of the lower series not passing very 

 abruptly into the leaves of the upper series. 

 G. The leaves of the lower series large, long- 

 petioled and very distant. 



H. Peduncles 1 cm. long or less to var. praestans 



H. Peduncles 2-8 cm. long....n. var. exuberans var. nov. 

 G. The leaves of the lower series middle-sized, 

 shorter petioles, more or less distant. 



I. Leaves pubescent....-^. 12. var. multiplex 



I. Leaves glabrate 13. var. perusta 



G. The leaves of the lower series middle-sized, 

 with short, stout petioles, and rather approxi- 

 mate 14 var. angustata 



E- The lower series of leaves passing imperceptibly and 

 without intermission into the leaves of the upper 



series 15. var. scalaris 



U. Pleads subcorymbose. 



K. Peduncles bearing 1-4 heads 



16. var. immanis var. nov. 

 K. Peduncles bearing only 1 head 



L. Terminal head 3 times larger than 



the other heads 17. var. crista galli var. nov. 

 L Terminal heads not a great deal 



