1921] NATURAL SCIENCES OF PHILADELPHIA. 461 



species of upland Texas, following Bailey's map, I have given 

 life-zone — but only to make as definite as possible my statement 

 of range. Usually I have been content with other terms. Nearly 

 everywhere through the West Gulf states, I have found collections 

 so few and remote as to make any statement of range only a skeleton 

 outline and a study of probabilities. 



We have quite insufficient collections from the West Gulf states. 

 Yet that there are many who have had some interest in this flora 

 the list of collectors at the close of this article testifies. To all 

 these collectors I feel my indebtedness; as also I am under obliga- 

 tions to the curators of the several herbaria, also listed herewith, 

 who have placed at my disposal the material in their care. The 

 Missouri Botanical Garden has undertaken a special investi- 

 gation of the plant-life of the West Gulf states, and Mr. Ernest J. 

 Palmer's work is giving us our best understanding of their flora. 



In the present outline, as in the study of southeastern Scrophula- 

 riaceae, are given full keys to contrasts noted, but these made to 

 apply only to species of the area considered. A further modifi- 

 cation of the phylogeny of this family, one which was introduced 

 in my study of the " Scrophulariaceae of Colombia," is to consider 

 Mimulus as a tribe apart from the Gratioleae. Synonomy is now 

 given, and the apphcation of each name explained; again this 

 data is only given as it pertains to native species or to species 

 proposed from this area. Available typic and isotypic material 

 has been studied, and the Academy's herbarium has proven rich 

 in the types of Nuttall's and of Leavenworth's Arkansas species. 



To show the basis for the summaries of distribution, and to enable 

 others from other view-points to work with this data, I am citing for 

 native species all localities from which specimens have been seen. 

 These are fisted by states, and alphabetically by counties, the name 

 of the county being followed by a colon. One collection to a county 

 is cited. The letters in parentheses following the collection-entry 

 refer to the herbarium in which the specimen may be consulted, 

 and their application may be found from the list of herbaria given 

 at the end of this paper. 



Corolla with the posterior lobes external in the bud. 



(ANTIRRHINOIDEAE.) 

 Capsule septicidal or locuficidal by a simple slit, the septum 

 breaking from the capsule-wall or rupturing. Corolla not 

 spurred nor saccate anteriorly. 



