PHYLLOSTACHYS FLEXUOSA 
AT first. sight it is certainly not easy to distinguish this 
species from the preceding one. There are, however, marked 
points of difference to which I have called attention under 
the description of PHYLLOSTACHYS VIRIDI-GLAUCESCENS, and 
which therefore I need not recapitulate here. With me, 
moreover, this species has not in five years attained more 
than half the height reached by P. vVIRIDI-GLAUCESCENS in the 
same period. The growth appears to be more compact, while 
the leaves are if anything smaller, but clothing the branches 
more densely. 
Though the differences which I have described require, it 
must be admitted, some closeness of observation to detect, 
yet they are sufficient to establish the distinct nature of the 
two plants. But if they are not enough for that purpose 
there remains an arrow in the quiver which cannot but hit 
the mark. In the year 1876 P. FLExUOSA flowered and 
fruited in the garden of the Hamma at Algiers, and in the 
gardens of Messrs. Thibaut and Keteleer at Sceaux, in France. 
Now Messrs. Riviere point out, and so far as I can ascertain the 
remark still holds good, the flower of P. VIRIDI-GLAUCESCENS 
has not yet been observed. The evidence is conclusive. 
I venture to take from Messrs. Riviere the following 
