The Geographical Distribution of the Frankeniaceae ete. 399 
II. 
The: Geographical Regions with their respective Species 
considered in detail. 
For the purpose of emphasizing the value of the geographical factor in 
the following pages, the geographical regions will form the main headings 
under which the species will be presented in their respective groups. 
l. The Mediterranean Region. 
The F. of the Mediterranean Region embrace Frankenia Subgen. Afra, 
and the genus Hypericopsis. 
Eufrankenia. 
Eufrankenia (incl. Protofrankenia Ndz.) will be taken as typical for 
the family, with the understanding that it is not thereby designated as the 
parent group, or even that it bears evidence of so great age as other 
groups. But that it has retained more nearly the type of the ancestral 
form appears supported by the fact that in species the most isolated geo- 
graphieally and the most pronounced in vegetative structure the floral 
structure of Eufrankenia is the one most regularly recurred to, — e. g., 
F. triandra Remy, and Beatsonia. 
Sect. Eufrankenia, while embracing some ten or twelve tolerably clearly 
distinguished forms, is with difficulty divided into well-defined species be- 
cause of the constant overlapping of forms. This is a feature likewise cha- 
racteristic of the corresponding sections in Australia and the Western 
Hemisphere, and is not without its significance in pointing out the relative 
age of sections Fufrankenia and Toichogonia cosmopolita to sections Toicho- 
gonia isolata and Basigonia, being one of the chief reasons for calling the 
former the modern developement of Frankeniaceae, in this article. 
As the purpose of the present study is not to offer a final revision of 
species, it must suffice to point out the recognisable forms and their geo- 
graphical limits, remarking here that where as in »Pflanzenfamilien« 
some nine species are pretty clearly defined, chiefly on anatomical charac- 
ters, in Boiss. Fl. Orient. I p. 780, and in the Ke w-Index the view is 
preferred of including all the species embraced in Sect. Eufrankenia (ex- 
cepting F. pulverulenta) as varieties under the oldest(?) name F. hirsuta L. 
The following synopsis includes the more prominent forms: 
the present condition of the Tamaricaceae in their geographic-genetic relationships. 
That Fougueria should be considered one of the Tamaricaceae by any close genetic tie, 
seems not very long tenable, 
