1186 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Stems hirsute or hirtellous. 

 Leaves mostly lance-oblong, obtuse or rounded at base. 



5. V. stenophyllum. 

 Leaves all or mostly ovate to oval, cordate at base. 

 Corolla glabrous outside. 



Pedicels glabrous 6. V, littorale. 



Pedicels hirsute 7. V. diadematum. 



Corolla variously pubescent outside. 

 Peduncles equaling or longer than the petioles. 



Peduncles 1 or 2-flowered 8. V. tingens.. 



Peduncles several-flowered. 



Corolla about 4 cm. broad 9. V. magnifolium. 



Corolla 1 to 2.5 cm. broad. 



Corolla about 1 cm. broad, the lobes longer than broad. 



10. V. reticulatum. 

 Corolla 1.5 to 2.5 cm. broad, the lobes about as broad 



as long 11. V. velutinum. 



Peduncles much shorter than the petioles. 



Corolla yellowish green 12. V. suberiferum. 



Corolla brown-purple 13. V. congestum. 



Corolla lobes oblong-linear to lance-oblong. 



Leaves mostly acute at base 22. V. caudatum. 



Leaves cordate at base. 



Calyx nearly as long as the corolla 14. V. triflonim. 



Calyx much shorter than the corolla. 

 Corolla glabrous outside. 



Corolla lobes ovate-oblong, fuscous 15. V. fuscum. 



Corolla lobes lance-linear, pale 16. V. petiolare. 



Corolla puberulent or papillose outside. 

 Calyx more than half as long as the corolla ; stems puberulent. 



17. V. fraternum. 

 Calyx half as long as the corolla or usually shorter; stems 

 usually hirsute or hirtellous. 

 Corolla green or yellowish. 

 Corolla lobes ovate-lancColate, long-acuminate. 



18. V. striatum. 



Corolla lobes oblong, obtuse 19. V. chrysanthum. 



Corolla purple, brown-purple, or fuscous. 



Cymes shorter than the petioles 20. V. stenopetalum. 



Cymes equaling or longer than the petioles. 



Corolla lobes oblong-linear 21. V, asperum. 



Corolla lobes lance-oblong. 



Lobes of the outer corona crenulate__27. V. crenatum. 

 Lobes of the outer corona lacerate-dentate. 



26. V. pilosum. 

 Corolla papillose or variously pubescent within, at least in the throat. 



Leaves acute or decurrent at base 22. V. caudatum. 



Leaves all or mostly cordate at base. 



Corolla merely papillose or puberulent within. 



Corolla glabrous outside 23. V. chloranthum. 



Corolla puberulent or hirtellous outside. 

 Corolla lobes oval, abruptly short-acuminate, in bud overlapping for 

 about half their breadth 24. V. macranthum. 



