1408 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM 



Heads much smaller, or else peduncles not fistulose. 

 Pappus caducous, of 2 paleaceous awns and 

 often a few squamellae. 



63. HELIANTHUS. 

 Pappus persistent (of 2 slender deciduous awns 

 in two species of Flourensia) or entirely 

 wanting. 

 Heads cjdindric; pappus none; involucre 

 strongly graduate. _ 54. AGIABAMPOA. 

 Heads not cylindric, or else pappus present or 

 involucre not strongly graduate. 

 Pales strongly accrescent, including and 

 greatly surpassing the achenes. 



52. MONTANOA. 

 Pales not strongly accrescent. 

 Heads discoid; pappus wanting. 



55. ZALUZANIA. 

 Heads radiate, or else pappus present. 

 Pappus a small cup of united squamel- 

 lae, sometimes with awns added. 



59. ASPILIA. 

 I'appus of usually free squamellae, with 

 or without 2 awns, or wanting. 

 Plants strongly resinous; leaves alter- 

 nate _.65. FLOURENSIA. 



Plants rarely resinous; leaves oppo- 

 site, at least below (in Viguiera 

 laciniata alternate and lacini- 

 ately repand-lobate) . 

 Pappus present. 

 * Pappus of 2 awns and several 



squamellae. 



61. VIGUIERA. 



Pappus of few subequal or un- 

 equal squamellae. 

 69. HYMENOSTEPHIUM. 

 Pappus wanting. 



Leaves pinnatilobate, or else 

 silky-pilose or canescent- 

 strigillose beneath. 



61. VIGUIERA. 



Leaves not pinnatilobate, neither 

 silky-pilose nor canescent- 

 strigillose beneath. 

 69.' HYMENOSTEPHIUM. 



Tribe VI. Helenieae. 

 Involucre distinctly graduate. Heads radiate, yellow. 



Leaves opposite 86. JAUME A. 



Leaves alternate. 



Pappus wanting; leaves triangular-ovate 87. VENEGASIA. 



Pappus present; leaves linear 88. CLAPPIA. 



Involucre equal or subequal (unequal in 95. Chaenactis, which has discoid ochro- 

 leucous heads). 

 Rays papery-persistent 89. PSILOSTROPHE. 



