Notes on Plants at Roraima. 155 
the new, and very beautiful Oncidium named and 
described by Mr. Ridley in the appended list as 
O. orthostates [No. 12]. Sometimes, too, in this same 
state of the eppelling, especially where such ground 
occurs on the brows of exposed hills, shrubs of consider- 
able size find anchorage in the furrows and flourish. One 
such hill-top which we passed was made very beautiful 
in this way by a large and isolated patch of the large 
rosy flowered Bonnetia sessilis, Benth, [No. 11]. In 
another similar place we passed through a distinctly 
marked patch of the compact Stiff tia condensata, Baker* 
[No. 10]. And more than one such place was distin- 
guished by thickets of Gomphia guianensis [No. 15]. 
Lastly, as regards the eppellings, where the furrows of 
these places have been worked down into the sandstone, 
and have been much enlarged, the deep ravines and pits 
of all sizes thus formed, though bare of vegetation 
wherever the process of water-washing still continues in 
violent action, are where this action has ceased, owing to 
the stoppage of the outlet, or has become much modera- 
ted, compatively thickly clothed with vegetation. 
Another remarkable localized plant, though not occur- 
ring on an eppelling, was the beautiful Aphelandra 
pulcherrima [No 14]. It has already been said that 
even on the otherwise open savannah, more or less 
extensive belts of forests often clothe the sides of the 
narrower parts of the valley through which the rivers 
run. One such place we came to, where, after crossing 
the Ireng river and the low watershed which there 
separates that river from its tributary the Karakanang, 
we were descending toward the level of the last-named 
river. It was here that, in a somewhat extensive wood 
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