128 



significance that they must be distinguished from the usual forms, 

 in any critical discussion of the vegetation. For this reason 

 they deserve a name. As a single condition produces similar 

 variation, it seems most logical to apply the same term to the 

 results of similar conditions. Accordingly I propose that 

 the ^term "arenarius" be used to designate those forms of 

 species of plants in which xerophytic adaptations are induced by 

 growth in sand. I append a description of such a form which 

 has come under my observation. 



Type. (Gates 2922) growing in sandy soil in the Andropogon 

 scoparius consocies of the bunchgrass prairie at Waukegan, Lake 

 County, Illinois, August 7, 1908. 



Photographs. Gates 163 (August 17, 1909) and Gates 347 

 (August 13, 1 9 10), the latter of which accompanies this article 

 as figure one. 



Specimens may be consulted at the Herbarium of the Univer- 

 sity of Illinois, the Field Museum of Natural History in Chicago, 

 (type) and the author's private herbarium. 



A similar form of Apocynum hypericifolium was commented 

 upon by Schaffner.* It may be termed Apocynum hyperici- 

 folium f. arenarium. Other such forms are under observation. 



These forms are always easily recognized in the field, but her- 

 barium specimens illustrating them are difficult to prepare. 

 Consequently ordinary herbarium material, unless fully labeled 

 does not furnish satisfactory data. This difficulty is in a large 

 measure obviated by the use of the camera and the notebook in 

 the field. 



University of Michigan, 



THE BOTANICAL NAME OF THE WILD SAPODILLA 



By N. L. Brixton 



The wild sapodilla or wild dilly, recorded by different authors 

 under various names, is of the genus Mimusops, and occurs in 

 southern Florida and through the Bahama Archipelago from 

 Abaco and Great Bahama to the Caicos Islands and Inagua. 



*Ohio Naturalist lO: 184. June 1910. 



