48 ROBINSON. 



Sect. II. SuBiMBRicATA (DC.) HofFm. (See Proe. Am. Acad. liv. 281.) 



Key to Species. 



a.^Leaves pinnate-veined, the lower veins not conspicuously 

 longer or larger. 

 b. Leaves on wingless petioles; blade cordate or hastate at 

 the broad base. 



Petioles very short, rarely over 1.5 mm. long 54. E. Weberbaueri. 



Petioles 1 cm. or more in length. 



Leaves cordate, with an open triangular sinus 24. E. glomeratum. 



Leaves with a deep narrow sinus at the base. 



Leaves cordate, acutish, almost regularly crenate-den- 



tate 25. E. Gascae. 



Leaves hastate, caudate-attenuate, with coarse and 



very unequal rounded teeth 26. E. anisodontum. 



b. Leaves on wingless petioles; blade rounded at the base (in 



E. persicifolium sometimes shortly acuminate at the point 



of insertion from a generally rounded base). 



Leaves ovate or elliptical, 1.5-2 times as long as wide, 



acute or barely acuminate. 



Leaves membranaceous, dull and puberulent to tomen- 



tellous above, the veins not depressed 27. E. endytum. 



Leaves coriaceous, shining and glabrous above, the veins 



reticulated and depressed 28. E. tarapotense. 



Leaves ovate- or lance-oblong, 2.5-4 times as long as wide, 



gradually acuminate or attenuate. 



Heads about 25-flowered; involucre campanulate-sub- 



cylindric, scales 30-40, at length of firm texture, in 4-6 



rows; achenes 5.5 mm. long; leaves permanently 



canescent-tomentellous beneath 12. E. persicifolium. 



Heads 16-19-flowered; involucre campanulate, scales 

 16-20, thin, in 3-4 rows; achenes 4-4.5 mm. long; 

 leaves at length green, subglabrate and prominently 



reticulated beneath 15. E. Salvia. 



b. Leaves lanceolate to ovate or broadly elliptical, cuneate 

 or at least obtusely pointed at base; petioles wingless, 

 rarely less than 1 cm. long c. 

 c. Leaves puberulent to villous beneath d. 



d. Leaves lanceolate, caudate-attenuate, remotely few- 

 toothed; pubescence conspicuously ferruginous . . .29. E. Mathewsii. 

 d. Leaves lance-oblong, denticulate, crenulate, or sub- 

 entire; pubescence white or merely dull, not ferrugi- 

 nous. 

 Heads 13-15-flowered. 



Leaves denticulate, canescent-tomentellous beneath, 



often 15-18 cm. long 13. E. buddleaefolium. 



Leaves serrulate, green and finely puberulent on the 



veins beneath, rarely over 1 dm. long .... 17. E. pseudarboreum. 

 Heads about 25-flowered; leaves somewhat canescent- 

 tomentellous beneath. 

 Leaves subentire, scarcely crenulate, cuneate at the 



base 14. £'. discolor. 



Leaves crenate-denticulate, the base rounded but 

 sometimes shortly acuminate at the point of in- 

 sertion 12. E. persicifolium. 



