2 Errata. 



Read " seedling " for " seedlings," line 18 from top of 

 p. 426. 



Read "identical" for " indentieal," line 15, p. 439. 



Read " exposure to " for " exposed," line 6 from bottom 

 of p. 448. 



Read " constitution " for " constition," line 10 from top 

 of p. 477. 



Omit hyphens in line 2 from top of p. 485. 



Read "degressive " for " digressive," line 18 from top of 

 p. 564. 



Read " decreasing " for " increasing," line 2 from top 

 of p. 639. 



Read " leaves of the group. All of the rosettes of the 

 whole" instead of line 6 from bottom of page 646. 



Read " Equisetum " for " Equiseteum," line 7 from top 

 of p. 649. 



Read " lateral branches " for " lateral-branches," line 13 

 from top of p. 649. 



Read " gamopetalism " for " gamepetalism," line 5 from 

 top of p. 661. 



Read " Rhododendron " for " Rhodondendron," line 9 

 from top of p. 661. 



Read "hybrids" for "hyprids," line 12 from top of p. 

 668. 



Read " uninjurious " for " injurious," line 8 from bottom 

 of p. 671. 



Omit line 6 from bottom of p. 674. 



Omit " are " from beginning of line 5 from top of p. 680. 



Read " uninjurious " for " injurious," line 7 from top 

 of p. 683. 



Read "belonging" for "belong," line 1, p. 699. 



Read " Euoenothera " for " Euonothera," lines 1 and 4 

 from top of p. 709. 



Read " bels " for " bles," line 21 from top of p. 717. 



Read " longest " for " tallest," line 8 from top of p. 722. 



