BOTANY OF SOUTHERN RHODESIA. 485 
Hotel, where the trees had possibly access to extra sources 
of moisture, and so came earlier into bloom, Brachystegia 
appendiculata, Acacia Welwitschii, Gleditschia africana, and 
Burkea africana, and, perhaps for the same reason, an Ochna 
Antunesii was a magnificent sight at the Foresters’ Camp. 
Judging from the fruit on the leafless trees, Combretum, Ter- 
minalia, Bauhinia, and Sterculia sp., with Afzelia euanzensis, 
Peltophorum africanum, and the evergreen Copaifera coleosperma, 
were the most common, including the huge Adansonia digitata, 
which stands out from all the other trees in height, peculiar 
branching, and smooth red bark. 
Below the Falls, in the vicinity of the Zambesi Gorge, and 
covering the area of the zigzags, we get what was the old bed of 
the river; and the change in the appearance of the vegetation 
quite limits this area. Here the basalt is mostly exposed, white 
patches of zeolite crystals appearing on the surface, also loose 
lumps of ferric oxide, perforated with round holes, which 
Professor Penck informed me had evidently been laid down 
round the roots of the Phragmites which fringed the banks and 
islands when the Zambesi flowed over this area; also loose 
flints, many of which were collected by Colonel Feilden during 
the visit of the British Association (1905), lie seattered over the 
surface. The trees in this area (Pl. 17. fig. 2) are markedly 
smaller; Peucedanum fraxinifolium and a Balsamodendron Sp. 
predominate, with Ximenia caffra, a gregarious Vellozia sp., and 
Myrothamnus flabellifolia as undershrubs. A Commiphora Sp. 
with white papery bark and an Albizzia sp. with shining grey 
bark, with Euphorbia Reinhardti, were most conspicuous on 
the face of the cliff, down to the river, 400 ft. below; the two 
former, pencilled out against the dark basalt as the sun's rays 
caught their light bark, and the dark green heads of the latter, 
emphasized by the general bareness. On the edge of these 
cliffs Selaginella imbricata formed a dense carpet in many 
places, of course dormant (inrolled) in the drought condition. 
Eugenia guineensis * Formation. 
This would include the immediate banks of the Zambesi 
River above the Falls, which is here about a mile broad, and 
the many green islands which dot its surface, both the one 
* I am indebted to Mr. C. F. Allen for this determination, as this species 
was not in flower or fruit at the time of my visit. 
