EUCALYPTUS HYBRIDS IN THE MEDITERRANEAN REGION. 251 
150 stomata per square millimetre. It should be noticed that in Z. 
botryoides the leaves have stomata only on the under surface, 200 per 
square millimetre; in H. rostrata the stomata are distributed on both 
surfaces alike. The angle of divergence of the secondary veins is equal 
to 55°-60°—midway between the angle of divergence of botryoides 
(65°-70°) and that of rostrata (45°-50°). The inflorescence is in axillary 
umbels carried upon a peduncle, a little flattened below the flowers, 
which have a short pedicel equalling the calyx-tube; their number varies 
from seven to twelve. The buds have an operculum of conical form, in 
most cases slightly beaked. The fruit is the size of a pea, and semi-oval, 
with the calyx-tube passing sometimes beyond the capsule, which at 
maturity opens by valves whose extremities are withered and dead. 
This character shown in the valves is very interesting. In H. rostrata 
the valves remain entire, standing erect, leaving the cells wide open; in 
E. botryoides the valves wither and fall; in EH. Rameliana the extremity 
only of the valves is withered—it is an intermediate case between the 
very different dehiscences of the two parents. 
By its vigour, the regularity of its outline, and the density of its 
foliage, this Eucalyptus deserves attention. 
Among the sowings made with seeds derived from the Cordier col- 
lection, there are often found new and very interesting forms, generally 
robust. 
My colleague, Dr. Boulier, has on his property a number of these 
plants which are already well developed ; particularly noticeable are— 
i. A Eucalyptus, probably a hybrid between gomphocarpus and 
cornuta, having a certain resemblance to H. occidentalis. 
2. AH. Gunn x globulus (?). 
3. A EH. Cornuta x Lehmann. 
In many of the cases it is not possible to determine exactly the species 
which has furnished the pollen—it can only be conjectured. 
From these observations, carried on for twelve years, it is proved that 
certain species of the genus Eucalyptus cultivated in the Mediterranean 
region can intercross and give birth to new types very distinct and 
having absolutely the appearance of legitimate species. Certain of these 
forms have progeny possessing a fecundity and a fixity which are very 
remarkable. 
These hybrids are interesting from the practical point of view, because 
they prove to be very robust and very foliose, and it is probable that 
some will eventually be preferred to the typical species introduced from 
their native country. 
