Fes. 1906.] FLORA OF: PORTUGUESE EAST AFRICA. 181 
buxifolix, a variable species, has a wide range in the dry 
zone. 
OLEACER, — Jasminum multipartitum and J. streptopus 
appear both to be found climbing over the bush thickets. 
Another species may be J. Walleri. Schrebera alata, small 
tree, hard wood, not very common. Olea verrucosa, a small 
tree found in a few localities. 
SALVADORACE. — Salvadora persica, a much-branched 
shrub very abundant by the coast and islands. The natives 
use the long lateral roots, soaked in water; makes a cooling 
drink; known as the “ mustard tree” of Scripture. 
APocyNACE®.—An interesting Order of plants and trees, 
extending over a wide range of the tropics. Landolphia: 
some forty species in Africa. These are the great  rubber- 
yielding vines that so much has been written about. 
Nearly all the species are confined to higher elevations. 
Only two species in the dry zone, and the vines are not over 
3 inches in diameter, whereas the others run 6 and 9 inches 
in diameter. They grow in the thick forest shade, rambling 
from tree to tree, and often found over 400 feet in length. 
The latex from the vines coagulates quickly by the atmo- 
spheric action, so no artificial aid is required to harden the 
substance. I have just written an article on all commercial 
rubbers, which will soon be published. Of the forty species 
known, only ten produce rubber of value.  Landolphia 
florida and petersiana are the dry-country species. Carissa 
Arduina and C. acuminata are both common rambling 
shrubs. Acokanthera spectabilis, shrubby tree, flowers 
fragrant. Acokanthera venenata, small tree; the. roots are 
very poisonous. Lawwolfia natalensis, common tree in the 
open grass lands on the coast. Plumeria rubra, found about 
habitations; been introduced. Voacanga Thouwarsii and 
V. lutescens, shrubs not uncommon by the edges of open 
forest and grass lands.’ Strophanthus petersianus, branched 
shrub, found in certain localities. Adenium multiflorum, 
small shrub, leafless when in flower, not uncommon. 
ASCLEPIADEZ.— faphionacme splendens and hk. densiflora 
both are to be found, with milky juice. Secamone frutescens, 
a twining shrub, often to be found. Jicrostephanus cernwus, 
same habit as the previously named plant. ysmalobiwm 
involueratum, rainbling plant with milky juice, not uncommon. 
