1919.] NATURAL SCIENCES OF PHILADELPHIA. 225 



baria of The New York Botanical Garden, the Brooklj^n Botanic 

 Garden, The Academy of Natural Sciences of Philadelphia, the 

 Universit}' of Pennsylvania, the United States National Museum, 

 (including the former Biltmore Herbarium), and the Charleston 

 IMuseum. In all institutions I have received the kindest attention 

 and assistance. 



The present revision follows a plan which should lead to a simple 

 and helpful presentation of our taxonomic knowledge of this family 

 within the area considered. Keys are given throughout, and these 

 are made so ample as to include all features of evident contrast 

 noted. Effort is made to group species and genera according to 

 real relationship, hence giving the keys a phylogenetic value. To 

 accomplish this, and to show what appears to have been the evo- 

 lutionary progress within this family, a rearrangement of the whole 

 has been made. This was first attempted in my " Scrophulariacese 

 of the Local Flora, ""^ but the placing of the Gratiolese as introductory 

 to the genuine Scrophulariacese now appears to me more satis- 

 factory. While of theoretic suggestiveness, it is hoped that these 

 keys may prove of practical service. 



Synonomy is given, so far as to explain the origin and application 

 of each specific and varietal name used, and to account for every 

 such name ever proposed from within this area. The original state- 

 ment as to the type or to typic distribution is quoted, and consequent 

 discussion is given. Practically all typic or isotypic^ material known 

 to occur in this country has been verified, and in Agalinis and allies 

 much of that abroad. Especially rich in types are the herbaria of 

 The Academy of Natural Sciences of Philadelphia, where Nuttall's 

 and de Schweinitz's plants are preserved, and of the Charleston 

 Museum, containing Elliott's collection. 



The statements of distribution, variability, season of flowering 

 and of fruiting, corolla-color, and other comment scarcely need 

 explanation. For Agalinis and allies, which I have collected re- 

 peatedly and over a wide range, my forthcoming monograph will 

 give a more detailed analysis of the range of each species. At present 

 for all species I am stating range in general terms, and shall trust 

 to receive corrections from workers who find this treatment partial 

 or erroneous. The detailed noting of corolla-color will be of interest 

 to students in the field. In every case, unless otherwise stated. 



iTorreya 19: 109-114. 1919. 



2 The word "isotype" is used to designate a specimen of the original collection, 

 other than the type itself . See Torreya 19: 13. 1919. 



