PREFACE TO THE SECOND EDITION. 



More than one hundred and iifty typographical and other errors detected 

 in the First Edition have been coiTected in this. Several names of species and 

 varieties have been added, and a few have been omitteil, where these chaii^-c^ 

 were necessary to accuracy; but the other names which appeared in the First 

 Edition have been retained, although tlii\v cannot all be found in Dr. Gray's or Dr. 

 Chapman's Manrials. 



Dr. Gray kindly looked over tlie Pluciioj;:mis. ;ind suggested the addition of 

 the following species, not included in tlie la^t erlition of liih Manual ; 

 33*. Kanunculus Jiederfireus. L. 

 210*. Viola renifolia. Gray. 

 278*. Elatine Clintoniana, Peck. 



483*. Paohystima Myrsinites, R:if . or, n. sp. Canliy. 

 612*. Dcsmodium lUinoense. Gi-ay. 

 787*. Rubus neglectus. Peck, (hybrid ?) 

 8.92*. Saxifraga Forbesii, Vasey. 

 2149*. Phlox steUaria, Gray. 

 239.5*. Polygonum Hartvvrightii, Gray. 

 2459*. Aroeuthobium minulum, Bngclm., n. sp. 

 2934*. Erythronium propuUans, Gray. 

 3542*. Danthonia compressa, Austin. 

 Dr. Gray would also cliange 

 2143. Phlox Carolina, L., to P. ovala, L. 

 2147. Phlox procumbens, Lehm., to I', anicena, Sims. 



These names are not place 1 in the text, bccmsc they arc not yet incluaod in 

 tlie Manual. 



Except some changes kindly suggested )jy Prof. Eaton, tlio Vascular Ciypto- 

 gamia are printed as in the Pivsfc Edition. 



It is requested that all further errors which may be detected in the Catalogue 

 may bo communioatcd. A coiiy of the Catalogue will be sent to the fli-st person 

 who coiTects each ciror. 



I have preferred to retain tlie Nos. of the First Edition for tiie convenience of 

 those persons who use the Catalogue. 



B. PICKJIAN MANN. 



Cami;r:dge, Feb. 1872. 



