156 TlMEHRl. 
of which most of the trees were common species of 
Cassia, we found the dense, shrubby underwood to 
consist almost entirely of this beautiful, scarlet flowered 
Aphelandra. 
Throughout a small tract on either side of the Ireng 
river, where the ground was almost entirely covered by 
a gravelly layer of shattered conglomerate, a very beau- 
tiful herb, with flowers of an intense violet blue — a very 
rare colour in Guiana, — was common and pleasantly 
reminded me of our English ' vipers bugloss.' It was 
Stachytarpheta mutabilis. v. [No. 1], which seems to me 
to correspond to my description of a localized species. 
Again, between the Ireng and the Cotinga rivers grew 
in abundance, and evidently as a native, a plant \Four- 
croya gigantea\ which, common enough near the coast 
of Guiana in cultivation, is nowhere else, as far as I have 
seen in many wanderings, wild in that colony. 
Lastly, as regards localized species, I would mention 
several dwarf bamboos, none of which unfortunately did 
I succeed in finding in flower. One of these, a wonder- 
fully graceful species, appears to me peculiar in Guiana, 
in that it grows in dense thickets, on the open savannah. 
This was on the Ireng river, and more sparingly onward 
from there toward the Cotinga. Another of these bam- 
boos [Chusquea [sp. ?] No. 18), I think the most graceful 
plant I ever saw occurred sparingly, and only in one 
spot, on the Arapoo river close to the village of Tooroi- 
king. A third bamboo, a climbing form [No. 359], occurred 
to me first on the same river, but is much more common 
on Roraima itself, and should perhaps be spoken of in 
connection with the vegetation of that mountain. 
Turning next to the areas of distinft vegetation, the 
