370 MR. G. MAW ON THE CLASSIFICATION AND 
varieties of C. cancellatus and C. hadriaticus, species which are 
not nearly allied, and the type-colourings of which differ from the 
Santa-Maura forms. Another remarkable case is that of the 
form of C. cancellatus, found on the Bithynian Olympus in asso- 
ciatlon with C. aérius, where it puts on the exact colouring of its 
companion ; moreover, there is a large series of variations in the 
markings of C. cancellatus which are exactly mimetic of the varia- 
tions in the colour of C. aérius with which it is associated. 
Ido not think that these are cases of hybridization; for, as 
far as my observations go, I have been unable to detect a single 
wild hybrid; nor do I know 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. 
Of Special Leaf-characters which seem to have to do with Geogra- 
phical Association.—In addition to the case of the two vernal 
Spanish species just 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 eorm-tunie 
structure. C. Fleischeri and C. parviflorus both occur in the 
Taurus; they have few structural characters in common ; and it 
is certainly remarkable that the singular stranded tunic found in 
no other species should be common to them both. 
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 only other point I have to refer to is the tendency to mor- 
phosis of nearly every part of a Crocus ; the membranous spathes 
occasionally become foliaceous, and a proper leaf is sometimes 
seen springing out of and bedded in the spathe. 
A stigmatie appendage to the anther is not unfrequent; m 
C. montenegrinus of Kerner, which he originally named C. appen- 
diculatus, it seems to be constant. The segments also become 
