CARDUACEAE. 361 



VI. DECUMBENTES. 



Leaves i -nerved, linear-oblanceolate ; the lower usually obtusish. 

 Plant 1.5-2 dm. high; pubescence of the leaves sparse, loose. 



22. E. simulans. 

 Plant i dm. high or less, usually monocephalous ; pubescence dense and 



appressed. 23. E. Engelmannii. 



Leaves 3-nerved, at least at the base, equally long-acuminate at both ends. 



24. E. microlonchus. 



VII. ELATIORES. 



Bracts very densely villous ; leaves entire. 25. E. elatior. 



Bracts sparingly villous ; leaves usually dentate. 26. E. Coulteri. 



VIII. SALSUGINOSI. 



One species. 27. E. salsuginosus. 



IX. MACRANTHI. 



Basal leaf -blades broadly obovate-spatulate, often denticulate ; stem-leaves dis- 

 tant, shorter than the internodes, not ciliate on the margins ; bracts glandular- 

 puberulent, seldom with a few hairs. 28. E. superbus. 



Basal leaf-blades oblanceolate, entire ; stem-leaves usually longer than the inter- 

 nodes, usually ciliate on the margins. 

 Bracts glandular-puberulent, not at all hirsute ; leaves glabrous. 



Leaves linear-lanceolate, dark bluish green and shining, minutely ciliolate. 



29. E. salicinus. 



Leaves not dark-green, dull, strongly hirsute-ciliate. 30. E. macranthus. 

 Bracts more or less hirsute. 



Stem and leaves glabrous or nearly so ; the latter ciliate only on the margins 

 and the veins below ; bracts glandular-puberulent and with scattered hairs. 



31. E. speciosus. 

 Stem and leaves hairy ; bracts hirsute or both hirsute and glandular. 



Leaves hirsute. 



Pubescence scant ; that of the stem long ; leaves linear-lanceolate. 



32. E. conspicuus. 

 Pubescence of the leaves and the involucres dense ; that of the stem short. 



Plant tall, green ; upper stem-leaves ovate or ovate-lanceolate, dis- 

 tinctly triple-nerved. 33. E. subtrinervis. 



Plant low, canescent ; upper stem-leaves lanceolate, scarcely triple- 

 nerved. 34. E. incanescens. 

 Leaves glandular-puberulent. 35. E. Vreelandii. 



X. GLABELLI. 



Involucres glandular-puberulent, sparingly if at all hairy. 



Stem with long white hairs ; the upper portion glandular-hirsute. 

 Lower leaves hairy ; stem low, stout. 36. E. viscidus. 



Leaves merely ciliate ; stem slender. 37. E. eximius. 



Stem glabrous ; upper portion glandular-puberulent ; leaves glabrate. 



38. E. Smithii. 



Involucre densely hirsute or strigose. 

 Bracts hirsute. 



Leaves glabrate ; plant evidently a perennial. 39. E. glabellus. 



Leaves more or less hairy ; plant in most cases apparently only biennial. 



40. E. consobrinus. 

 Bracts strigose ; basal leaves linear-oblanceolate, denticulate. 



41. E. strigulosus. 



XI. RAMOSI. 



One species. 42. E. ramosus. 



XII. PHILADELPHICI. 

 One species. 43. E. philadelphicus. 



