248 CARDUACEAE 



Basal leaves narrowly spatulate; stem-leaves oblanceolate. 



38. E. condensatus. 

 Leaves Unear-flliform. 33. E. nematophyllus. 



Heads discoid; leaves narrowly linear. 34. E. Bloomeri. 



V. PUMIU. 

 Pubescence of rather long hairs ; branches of the stem almost erect. 

 Heads radiate. 



Stems over 1 dm. high, when well developed, with more than one head each. 

 Ray-flowers white. 



Outer pappus of small inconspicuous bristles; plant copiously hairy. 



35. E. pumilus. 

 Outer pappus of broad squamellae; plant sparingly hairy. 



36. E. Brandegei. 

 Eay-flowers blue or purplish; outer pappus conspicuous and squamellate. 



37. E. concinnus. 

 Stems usually less than 1 dm. high and usually monocephalous. 



Leaves spatulate. 38. E. condensatus. 



Leaves narrowly linear-oblanceolate. 32. E. nanus. 



Heads discoid. 39. E. aphanaclis. 



Pubescence very short; branches of the stems spreading. 72. E. Wootonii. 



VI. Dectjmbentes. 

 Leaves 1-nerved, linear-oblanceolate; the lower usually obtusish. 26. E. Bngelmannii. 

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

 Pubescence of the leaves loose, hirsute and somewhat glandular-puberiilent. 



40. E. decumbens. 

 Pubescence of the leaves appressed-strigose. 41. E. microlonchus. 



VII. Elatiores. 

 Bracts very densely villous, squarrose; leaves entire. 42. E. elatiof. 



Bracts sparingly villous ; leaves usually dentate. 



Ligules white; bracts scarcely squeirrose; stem sparingly pubescent. 



43. E. Coulteri. 

 Ligules blue or purple; bracts squarrose; stem densely pubescent above. 



44. E. peregrinus. 

 VIII. Saisuginosi. 



Rootstock thick; leaves thickish, acute; bracts narrowly linear-lanceolate, with strongly 

 spreading tips. 

 Peduncles mostly solitary, finely strigose; stem single from the rootstock. 



45. E. salsuginosus. 

 Peduncles usually more than one, scabrous; stems several from a caudex. 



49. E. eucephaloide.i. 

 Rootstock slender; leaves thin, with long mucronate tips; bracts narrowly linear-subu- 

 late, only slightly spreading. 46. E. Howellii. 



IX. Macranthi. 

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

 shorter than the internodes, not cUiate on the margins; bracts glandular-puberulent, 

 seldom with a few hairs. 47. E. superbits. 



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

 usually cihate on the margins. 

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

 Leaves Unear-lanceolate, minutely ciholate. 



Leaves dark green; bracts not with loose tips. 48. E. salicinus 



Leaves light green; bract with spreading tips. 49. E. eucephaloidcs. 



Leaves not dark green, dull, strongly hirsute-ciUate. SO. E. macranthus. 



Bracts hnear, more or less hirsute. 



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

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



51. E. speciosus. 

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



Leaves hirsute. 



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



52. E. conspiaivs. 

 Pubescence of the leaves sind the involucres dense, that of the stem short. 



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

 tinctly triple-nerved. 52. E. subtrinems. 

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

 nerved. 54. E. incanescens. 

 Leaves glandular-puberulent. 55. E. Vreelandii. 



X. Glabelli. 

 Involucre hirsute or strigose, not at all glandular. 



Leaves glabrous, except the ciliate margins. 56. E. glabellus 



Leaves more or less pubescent. 



Pubescence loose and spreading. 57. e fruticetorum 



Pubescence appressed. 58. E. Earlei. 



Involucres more or less glandular, sometimes also hirsute. 

 Leaves glabrous, except the ciliate margins. 



Stem pubescent, especially above, only sUghtly glandular. 



Bracts narrowly linear-subulate; ligules usually bluish or pink. 



