TO SOUTH-AFRICAN BOTANY. 179 
REVISED List OF PUBLISHED SPECIES OF ORCHIDEE INDIGENOUS 
IN EXTRA-TROPICAL SOUTH AFRICA. 
The following list is a revision, with additions and alterations, 
of that which the Society did me the honour to publish in its 
Journal for 1882, vol. xix. pp. 335-347. 
Our knowledge of South-African Orchids has been consider- 
ably extended in the interval which has elapsed; and many new 
species, besides additional genera, have been added to the Flora 
of the Region here treated of. 
The extrication of the synonymy, owing to the many old spe- 
cies in the herbaria of Thunberg and Swartz, has been a difficult 
task. For aid in this I am greatly indebted to Mr. N. E. Brown, 
A.L.S., of the staff of the Royal Herbarium, Kew, the results of 
whose scrupulously careful comparison of Thunberg's Orchids 
(not yet published) have been most generously placed at my 
disposal, and without which this part of my work could not have 
been completed. A few doubtful points, owing to the non-exist- 
ence of types in the herbaria named, are still unavoidably left. 
In the present list I have made an attempt to add, roughly, the 
distribution of the species as a contribution to phyto-geography, 
and an aid and guide to South-African students and collectors. 
The results are tabulated in the subjoined summary (Table, 
p. 210). 
These show that the South-Western is inferior to the South- 
Eastern Region in respect of number of species, having 168 and 
182 respectively ; while the Karroo Region has only 3. 
The tribes, however, are divided in very different proportions: 
the Epidendrex, Vandex, and Neottiez largely predominating in 
the east, while the Ophrydee are in excess in the west. Taking 
the first three tribes together, there are 17 species in the south- 
west against 64 in the south-east, 5 species being common to 
both. Of the Ophryde® there are recorded 151 species in 
the south-west against 118 in the south-east, 25 species being 
common to both. These figures confirm the known affinity 
of the Flora of the South-Eastern Region with that of Tropical 
Africa and India, and agree with the marked separation of the 
South- Western Flora in so many other elements from its neigh- 
bouring Region. The great Orchid centre of the latter is now 
known with tolerable certainty to be the Cape Peninsula, the 
extreme south-western corner of the continent, where, in a little 
