BOTANY OF SOUTHERN RHODESIA. 465 
ILLECEBRACEX. 
POLLICHIA CAMPESTRIS, Ait. 
Victoria Falls, islands. Fl. Sept. 118. 
Distrib. Tropical and South Africa. 
AMARANTACEÆ. 
ACHYRANTHES ASPERA, Linn. 
Victoria Falls, Rain Forest and islands. Fl. and Fr. Sept. 
171. 
Distrib. Widely spread in the Tropics. 
ALTERNANTHERA SESSILIS, R. Br. 
Victoria Falls, banks of river, amongst reeds. Fl. Sept. 121. 
Distrib. Widely distributed in the Tropics. 
PoryGoNACEEX. 
POLYGONUM HERNIARIOIDES, Del. 
Matopo Hills, sand-banks in streams. Fl. Sept. 63. 
Distrib. Angola, Amboland, Zambesi District, Rhodesia 
(Gardiner, Herb. Kew.). 
PoposteEMacEez. (Dr. Rendle.) 
TRISTICHA TRIFARIA, Tul. 
Victoria Falls, Livingstone Island. Fl. Sept. 320. 
Distrib. Angola, Niger, Madagascar, Mascarenes. 
This little plant was conspicuous by the bright green junger- 
manniaceous shoots, closely adpressed to the rock, in a shallow 
runnel where the water was rushing over the very edge of the 
cataract. The flat thallus encrusted the rock, bearing on it the 
little flowering shoots, not more than 2 cm. long. 
T. ALTERNIFOLIA, Tul. 
Victoria Falls, in river, on submer ed rocks and stones. FI. 
aud young Fr. Sept. 321. 
Distrib. Niger, Congo, Nile, Central Africa. 
This species was abundant, covering all the shallower rocks 
and stones, where there was no rush of water. The long red 
filamentous branches are very alga-like in appearance, floating 
freely. 
