50 ROBINSON. 



i. Leaves velvety-puberulent to tomentose beneath. 



Leaves entire, rounded at base 40. E. trachyphi/Uum. 



Leaves crenate-dentate, cordate at base 24. E. glomerahmi. 



i. Leaves glabrous beneath j. 

 j. Leaves 4-10 cm. long or more. 



Leaves broadly ovate, thin, rounded or cordate at 



the wide base 41. E. acuminatum. 



Leaves ovate-lanceolate to elliptical, thickish, acute 

 at the base. 

 Heads subsessile on the flexuous ascending branches 

 of an ample racemose panicle; leaves elliptical, 



reticulated on both surfaces 42. E. crenulatum. 



Heads in dense round-topped corymbs. 

 Involucral scales conspicuously arachnoid-cilio- 



late; leaves dull above, 1.5-2.3cm. wide. .34. E. drepanoides. 

 Involucral scales minutely and obscurely ciliolate; 



leaves lucid above, 3-6 cm. wide 35. E. coelocaule. 



j. Leaves small, less than 1 cm. in diameter, broadly 



ovate, obovate, or suborbicular 53. E. incarum. 



h. Heads 8-12-flowered k. 

 k. Leaves lanceolate, ovate, or suborbicular, obtuse, 

 rounded or cordate at base (in some cases very shortly 

 acuminate at attachment of petiole) I. 

 I. Leaves small (about 1.6 cm. long), obtuse. 55. E. chamaedrijolium. 

 I. Leaves larger (4—12 cm. long), acute or acuminate, or 

 conspicuously narrowed to a blunt apex m. 

 m. Leaves rather deeply cordate with a triangular 

 sinus; heads nearly sessile in globose glomerules. 



24. E. glomeraturri. 

 m. Leaves obtuse, rounded, truncate at base, or 

 shallowly and broadly cordate; heads often 

 crowded in compound corymbs but not in dense 

 globose glomerules. 

 Petioles (of the mature cauline leaves) 17-32 mm. 

 long. 

 Leaves at length rugose-bullate above, conspicu- 

 ously reticulated beneath, the nerves connected 

 by prominulent and subregular cross-veins, 



these densely villous 43. E. Stuebelii. 



Leaves membranaceous, neither bullate above nor 



prominulently reticulated beneath 44. E. callacatense. 



Petioles 8-10 mm. long. 



Involucral scales broad, the intermediate and 

 inner elliptical, stramineous, nearly smooth, 

 3-5-ribbed, the outer suborbicular, loosely 



pubescent 45. E. urubambense. 



Involucral scales narrowly oblong, densely white- 



tomentose, obscurely 1-nerved 46. E. leucophyllutn. 



k. Leaves rhombic-ovate or -lanceolate, acutish to acumi- 

 nate or attenuate at base. 

 Leaves merely acutish at base and definitely petioled, 

 soft-pubescent above, glandular-punctate and puberu- 



lent beneath : 31. £■. helianthifoUum. 



Leaves attenuate at base to an often short and obscure 

 petiole, somewhat scabrous to tomentose above, 

 densely canescent-tomentose beneath 47. E inulaefoUum. 



