ERRATA. 
Page 106. After generic description. of Rigiopappus read 
‘*R. leptocladus.—Niles. Spring.” 
Page 163. For ‘‘ Gillia” read ‘‘ Gilia.’”’ 
Page 163. For ‘“androscaea’’ read ‘‘ androsacea.”’ 
Page 171. 6th line from bottom, for ‘‘decuscate’’ read 
‘* decussate.” 
Page 172. 9th line from bottom, for ‘‘L’’ read ‘‘§.” 
Page 215. 7th line from top, after “h.’’ insert ‘*— 
Niles. Summer.” 
Page 262. 10th line from bottom, omit comma between 
‘late’ and ‘‘ dehiscent.” 
Page 275. 12th line from top, for ‘‘7”’ read ‘‘5.”" 
Page 283. 4th line from top, for *‘Californicus” read 
‘*Californicum.”’ 
Page 299. 11th line from top, after ‘‘not” insert ‘at.” 
Page 311. Ist line, for ‘‘tenela’’ read ‘‘ tenella.” 
Page 330. For ‘‘ Pillularia’’ read ‘‘ Pilularia.” 
