250 CARDUACEAE 



Ligules white, 1.5-2 mm. wide. 91. E. montanensis. 



Stem 3-8 cm. high, scapiform, leafless or few-leaved. 



Pubescence of tlie stem appressed or ascending; stems decumbent at the base. 

 Leaves grayish strigose, in age glabrate: bracts hirsute. 



Bracts linear, acuminate; Ugules mostly purple, 7-S mm. Ions. 



92. E. Scribneri. 

 Bracts lance-hnear, acute: ligules mostly wliite. 30. E. radiratus. 



Leaves and bracts silvery strigose. 101. E. pulrinatus. 



Pubescence of the stem spreading; stems erect; leaves densely hirsute; ligule-i wliite. 



93. E. Farryi. 

 XXII. Tetr.'VPLEurv 



Ligules fully 1 cm. long, white; involucres about 1 cm. broad. 94 E. utahensis. 

 Ligules 5-6 mm. long, .sky-blue or pinkish; involucres 6-8 mm. broad. 



95. E. sparsifoUus. 



XXIII. FiLIFOLII. 



Involucres hirsute. 96. E. filifolius. 



Involucres strigose. 97. E. linearis. 



XXIV. LUTEI. 



Bracts strigose or hirsute; plant cespitose; leaves narrowly linear. 



Stems scapiform, naked or with a few small leaves; bracts strigose. 



98. E. lulcus. 

 Stems more or less leafy; bracts hirsute. 



Petioles of the leaves hirsute-cihate. 99. E. ochroleticus. 



Petioles as well as the blad&s finely cinereous-strigose. 100. E. pence phyllus. 



Bracts long-villous; leaves spatulate. 14. E. aureus. 



46. LEPTILON Raf. Horseweed, Canada Fleabaxe. l. L. canadense. 



47. ESCHENBACHIA Moench. i. E. Coulteri. 



48. BACCHARIS L. Groundsel Tree. 



Pappus copious, in fruit elongatmg and surpassing the styles. 



Pappus-bristles m several series; plant 3-6 dm. high, herbaceous, with a woody base. 



1. C. Wrighlii. 

 Pappus-bristles in one series; plants 1-5 mm. high, shrubby. 



Fertile heads hemispherical, 5-10 mm. broad; bracts all acute. 2. B. salicina. 

 Fertile heads deeply campanulate, 3-5 mm. broad; outer bracts obtuse. 



3. B. Emoryi. 

 Pappus scant, little if at all elongating, in fruit not exceeding the styles. 



Achenes 10-nerved; leaves less than 2 cm. long, subentire. 4. B. serriUnides. 



Achenes 5-nerved; leaves 5-15 cm. long, serrate. 5. B. gluiinosa. 



49. BERTHELOTIA DC. l B. sericea. 



50. STYLOCLINE Xutt. l. S. micropoides. 



51. ANCISTROCARPHUS A. Gray. l. A. filagineus. 



52. PSILOCARPHUS Nutt. 



Involucres with long loose wool; upper leaves not narrowed at the base. 1. P. elatior. 

 Involucres with very short wool; leaves all narrowed at the base. 2. P. orcganus. 



53. DIAPERIA Nutt. i- D. prolifera. 



54. OGLIFA Cass. l- O. californica. 



55. ANTENNARIA Gaertn. Cats-Paws, Everlasting. 

 Pappus-bristles of the staminate heads with clavate or scarious-dilated tips. 



Plants surculose-proliferous with prostrate leafy stolons. 

 Plant caulescent. 



Heads racemose or paniculate, long-peduncled ; involucres almost glabrous. 



I. Racemosae. 

 Heads in cymose clusters or rarely solitary; involucres woolly at the base. 

 Bracts of the involucres with green or brown upper portion. 



II. Alpinae. 

 Bracts of the involucres with wliite or pink upper portion. 

 Heads 5-8 mm. high. 



Bracts usually with bright pink upper portion. 



III. Roseae. 

 Bracts with white upper portion. 



Leaves of the stolons narrowly oblanceolate, 1.5-5 cm. long; 



bracts with dark sj^ots. IV. Nakdinae. 



Leaves of thestolons rliombic to spatulate, 0.5-3 cm. long; bracts 

 with dark spots only in no. 23. V. Aridae. 



Heads 8-12 mm. liigh. 

 * Leaves tomentose on both sides. VI. Apricae. 



Leaves glabrous above. VII. Campestres. 



