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. simnlans. 

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

 appressed. 2^. E. Engelmannii. 



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



24. E. microlonchns. 



Vn. Elatiores. 



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



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



VIII. Salsuginosi. 

 One species. 27. E. salsuginosiis. 



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. inacranthns. 

 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, speciostts. 

 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. 3S- 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. consobriniis. 

 Bracts strigose ; basal leaves linear-oblanceolate, denticulate. 



41. E. strigi-ilosus. 

 XL Ramosi. 



One species. 42. E. ramosus. 



XII. Philadelphici. 

 One species. 43. E. philadelphicus. 



