216 



Leaves truncate, cordate, or abruptly 

 rounded at base 



2. Flowers axillary 



Flowers in racemes or stalked heads . . . 



3. Flowers in racemes 

 Flowers in heads 



4. Petioles winged or none 

 Petioles cylindric 



5. Petioles winged 

 Petioles none 



6. Stem clothed with soft spreading hairs 

 Stem glabrous, strigose or adpressed 



pubescent ... 



7. Stipules fringed 

 Stipules eciliate 



8. Leaves cottony beneath 

 Leaves glabrous 



9. Leaves elliptic, obtuse... 

 Leaves lanceolate or linear, acute 



10. Racemes dense ... 

 Racemes lax 



11. Leaves gradually narrowed at the base 

 Leaves subobtuse at the base ... 



12. Leaves adpressed villous 



Leaves glabrous with margin and 

 nerves scabrid 



13. Achenes winged 

 Achenes wingless 



14. Flowers capitate 



Flowers racemose or cymose ... 



15. Stems smooth ... 



Stems with reflexed prickles ... 



16. Stipules ciliate ... 

 Stipules withou t ciliae ... 



17. Stipules foliaceous, not tubular 

 Stipules tubular, scarious 



18. Leaves peltate ... 

 Leaves not peltate 



19. Lower lobes of leaf rounded ... 

 Lower lobes of leaf acute 



20. Leaf margin minutely scabrous 

 Leaf margin retrorsely prickly 



21. Achene obscurely trigonous ... 

 Achene orbicular biconvex 



22. Flowers cymose 

 Flowers racemose 



23. Petioles equal to the stipule ... 

 Petioles many times exceeding the 



stipule 



24. i*cduncles glandular 

 Peduncles eglandular ... 



2.5. Racemes dense, continuous 



Racemes lax, interrupted 



