GEOGRAPHICAL DISTRIBUTION. ,, 



of any authenticated case of the production of garden hybrids. It has been 

 suggested that the sterile C. stellaris, an old garden plant, the origin of which is 

 unknown, may be a hybrid between C. aureus and C. susianus; but mere sterility 

 is not sufficient evidence, as it is within my own experience that many wild species 

 tend to sterility after only two or three years cultivation. 



Special characters related to Geographical Association.— \n addition to the case of 

 the two Spanish species, C. carpetanus and C. nevadensis, already referred to, I would 

 notice the remarkable identity of special leaf-structure, in which the keel is developed 

 to nearly the width of the blade in C. zonatus, C. vallicola, and C. Scharojani, 

 three species from eastern Asia Minor, a character found in no other species. 



There is also a similar case in relation to special corm-tunic structure. C. 

 Fleischeri and C. parviflorus both occur in the Taurus, the former also in western 

 Asia Minor; they have few structural characters in common, but the singular 

 stranded tunic is common to them both, and also identical with the tunic structure 

 of one or two eastern species of Xiphium, with which they are geographically 

 associated. 



A case of geographical variation in the anther, common to two species, is 

 presented in C. biflorus, and C. chrysanthus : the anthers of both of these species 

 are normally yellow, but in western Bithynia they both vary with a dark spot at 

 the base of the anther. 



The relation of Specific Groups to Geographical Distribution.— -The following 

 tabular analysis of the species will concisely explain the relation of specific grouping 

 to geographical distribution; generally exhibiting the geographical intermingling 

 of different types, and an occasional and exceptional association of species that 

 can be grouped by common structural characters. 



A. West European and N. West African district, including Portugal and Spain, the Balearic 

 Islands, France, excepting the Alps, and N.W. Africa. 



B. Swiss and French Alps, Italy as far east as Venice, Sicily, Malta, Sardinia and Corsica. 



C. East European district, between the longitude of Venice, and Odessa, including Dalmatia, the 

 Danubian Principalities, the Carpathians, Greece, the Ionian Islands, the Greek Archipelego and Crete. 



, a D "r n^^ Min u°\ CyPU,S and Kurdistan ' Circassia, the Crimea, Southern Russia east of the longi- 

 tude of Odessa, the district west of the Caspian, and N. Persia. 



■k- Syria and Persia. 



F. Central Asia and east of the Caspian, Ala Tau Mountains, and Samarkand. 



