577 
Erythrococca and Micrococca. 
a position the acceptance of which seems impossible. But the fact that we are 
unprepared to adopt his conclusions does not lessen our appreciation of the 
insight which has led Baillon to realize the crucial importance, in the study 
of this particular group of types, which attaches to the position of the genus 
Micrococca . If, in regard to this, the treatment by Bentham be sound, the 
maintenance of the other allied genera is practically assured, whereas, if that 
of Thwaites be warranted, the suppression of Erythrococca becomes a logical 
corollary. But the exhaustion of one line of inquiry does not debar us 
from taking up another. We are no more bound in this case to concede 
that staminal characters alone count than compelled to accept the contrary 
view. It is, therefore, open to us to examine whether Micrococca , Erythro- 
cocca , and Claoxylon may not be distinguishable by characters other than 
staminal. 
A detailed revision of the genus Claoxylon , A. Juss. (1824), forms, it 
should be explained, no part of the purpose of this paper. At the same 
time, owing to the fact that Claoxylon is older by a quarter of a century than 
the other two genera concerned, it is necessary to undertake such a general 
review of this genus as is required for an exact appreciation of the relation¬ 
ship which it bears to its two allies. 
In the only monograph of Claoxylon that has yet been attempted, 
Mueller in 1866 (DC. Prodr., xv. 2, 775-90) subdivided the genus into six 
sections, characterized as follows :— 
§ 1. Adenoclaoxylon, Muell. arg.: Dioecious shrubs with perulate buds; 
stamens mixed with interstaminal glands, and surrounded by an extra- 
staminal urceolum ; anthers opening extrorsely. 
§ 2. Athroandra, Hook, f.: Dioecious shrubs with perulate buds; 
stamens mixed with interstaminal glands, but not surrounded by an extra- 
staminal urceolum ; anthers opening extrorsely. 
§ 3. Discoclaoxylon, Muell. arg.: Dioecious trees with non-perulate 
buds ; stamens surrounded by an extrastaminal urceolum, but not mixed 
with interstaminal glands. 
§ 4. Gymnoclaoxylon, Muell. arg.: Dioecious trees or shrubs with non- 
perulate buds; stamens neither mixed with interstaminal glands nor sur¬ 
rounded by an extrastaminal urceolum ; anthers opening extrorsely. 
§ 5. Euclaoxylon, Muell. arg.: Dioecious trees or shrubs with non- 
perulate buds ; stamens mixed with interstaminal glands, but not sur¬ 
rounded by an extrastaminal urceolum ; anthers opening extrorsely. 
§ 6. Micrococca, Muell. arg.: Monoecious annual herbs with non-peru¬ 
late buds; stamens mixed with interstaminal glands, but not surrounded by 
an extrastaminal urceolum ; anthers opening introrsely. 
Bentham in 1880 (Gen. Plant., iii. 309) declined to follow Mueller in 
accepting the suppression of Micrococca proposed by Thwaites. At the same 
time Bentham refused to recognize the rest of Mueller’s sections because the 
