Erythrococca and Micrococca. 605 
African continent or to the islands in the Gulf of Guinea, save one which 
extends from Abyssinia to Southern Arabia. 
Claoxylon , on the other hand, which in 1866, when allowance has been 
made for the removal of Adenoclaoxylon , Athroandra , and Micrococca , was 
believed to contain thirty species, is now known to include about forty-five 
distinct forms, of which only three are African. The others are natives of 
the Mascarene Islands (fifteen), South-Eastern Asia (fourteen), Polynesia 
and New Caledonia (nine), and Australia (four). The three African species 
belong to an endemic section, Discoclaoxylon , so distinct that no harm 
could result were it treated as a different genus. A fourth African species, 
C. sphacrocarpmn , Kuntze (Rev. Gen. Plant, iii. 2, 248), has indeed been 
described from South Africa. The material on which this species is based 
we have had no opportunity of seeing. Its author has indicated that this 
material is incomplete ; from the careful description which Kuntze has 
provided it is, however, almost certain that the plant in question belongs 
to another genus, and there is no evidence that any species belonging to 
Claoxylon proper, as originally defined by A. Jussieu, occurs on the African 
continent. 
As the whole of the species included in Micrococca and Erythrococca 
have been described elsewhere, all that seems called for here is a revised 
definition of each of these genera, modified in accordance with existing 
knowledge and supplemented with a systematized enumeration of the forms 
that appear referable to each. In consequence of the fact that, of the two, 
Erythrococca— the inclusion of which in Claoxylon has never been proposed 
—is more closely related to Claoxylon than Micrococca is, it is desirable to 
reverse the order of their presentation. The enumerations themselves are 
based on an examination of the material of both genera preserved in the 
herbaria at Kew, the British Museum, and Berlin, with, in addition, in the 
case of Erythrococca , the material in the herbaria at Brussels and Paris; in 
the case of Paris the African collections of Dr. Chevalier have also been 
available. The specimens of Erythrococca in the post-Prodromus collection 
of the de Candolle herbarium and in the herbarium of the Natal Botanic 
Garden have also been studied, as have the specimens, illustrating both 
genera, collected by Dr. Schweinfurth, which are preserved in the Boissier 
herbarium. To his friends Dr. Rendle, Professor Engler, Professor De 
Wildeman, Professor Lecomte, Mr. de Candolle, Mr. Medley Wood, and 
Mr. Barbey, the writer is deeply indebted for the kind help thus afforded. 
He is further greatly indebted to his friends Professor Schinz and Professor 
Briquet for permission to study the types of Claoxylon Menyharthii , which 
is preserved in the Zurich herbarium, and of Trezuia? africana , which is 
preserved in the De Dessert herbarium. 
