CORRECTIONS AlfD ADDITIONS. 



P. 172. — Substitute "rough Kansan " for "Wisconsin moraine" in 8th 



line from bottom. 

 P. 174.- — Substitute "Kansan" for "Wisconsin" in 8th line from top. 

 P. 223. — In 5th line from bottom, in footnote, insert "and"" after 



' ' cusp ' ". 

 P. 226. — In 19th line from top write "pauciflora" instead of "Uauci- 



flora". 

 Omit the following letters from the table of jdants, pp. 174-184: 



H in column III opposite Ambrosia trifida integrifolia, Anemone 

 patens Wolfgangiana, Artemisia dracunculoides, Aster laevis, 

 and Ceanothus ovatus pubescens. 

 J in column II opposite Aster laevis and Chenopodium leptophyllum. 

 L in column II opposite Prenanthes racemosa. 

 Substitute M for J in column VI opposite Pycnanthemum pilosum. 

 Insert the following letters in the table: 



cL in column II opposite Artemisia dracunculoides, Bouteloua hir- 



suta, and Cirsium altissimum. 

 c in column II opposite Astragalus canadensis, and in column III 



opposite Cirsium discolor. 

 cJ in column Y, and cM in column YI opposite OEnothera rhombi- 

 petala. 

 Insert the following in table: 



OEnothera fruticosa hirsuta Nutt., dJ in column II and dM in col- 

 umn YI. 



