444 APPENDIX. No. V. 
should then propose to apply the name of AquiLaRiINe in preference to 
Chailletez. 
The genus Aquilaria itself has been referred by Ventenat to Samydew. 
From this order, however, it is sufficiently distinct, not only in the structure of 
its ovarium and seeds, but in its leaves bemg altogether destitute of glands, 
which are not only numerous m Samydez, but consisting of a mixture of round 
and linear pellucid dots, distinguish them from all the other families* with 
which there is any probability of their bemg confounded. 
Sir-James Smith+ has lately suggested the near affinity of Aquilaria to 
Euphorbiacex. But I confess it appears to me at least as distinct from that 
order as from Samydeze: and I am inclined to think, paradoxical as it may 
seem, that it would be less difficult to prove its affinity to Thymelez than to 
either of them; a poimt however which, requiring considerable details, I do 
not mean to attempt in the present essay. 
Of EUPHORBIACE4 there are twenty species in the collection, or one 
twenty-eighth part of its Phaenogamous plants. This is somewhat greater than 
the intratropical proportion of the order as stated by Baron Humboldt, but 
rather smaller than that of India or of the northern parts of New Holland. 
The most remarkable plants of Euphorbiacez in the Congo herbarium are ; 
a new species of the American genus Alchornea; a plant differing from 
gopricon, a genus also belonging to America, chiefly in its capsular fruit ; 
two new species of Bridelia, which has hitherto been observed only in India; 
and an unpublished genus that I have formerly alluded to,} as in some degree 
explaining the real structure of Euphorbia, and from the consideration of 
which also it seems probable that what was formerly described as the herma- 
phrodite flower of that genus, is in reality a compound fasciculus of flowers.§ 
From the same species of this unpublished genus a substance resembling 
Caoutchouc is said to be obtained at Sierra Leone. 
According to Mr. Lockhart a frutescent species of Euphorbia, about eight 
* The only other genus in which I have observed an analogous variety of form in the 
glands of the leaves, is Myroxylon, (to which both Myrospermum and Toluifera belong,) 
in all of whose species this character is yery remarkable, the pellucid lines being much 
longer than in Samydez. + Linn. Soc. Transact. 11, p. 230. 
} Flinders’s Voy. 2, p. 557. § Linn. Soc. Transact. 12, p. 99. 
