ERRATA. 
Fage 43, line 4, for Bigeloria, read Bigetowia: 
226, “ 21, for speciform, read spiciform. 
‘< 245, “ 8, for of the type, read as the type. 
“ 207, “ 13, for T. augustata, read T. angustata. 
" 272, * 26, for var. biennis, read var. canescens. 
