DE. F, MUELLEe'S MONOGEAPH OF THE EUCALYPTI. 81 



of the Guainia, the name given to the G-uainiu above its confluence 

 with the Casiquiare, and also on the Atabapo, an affluent of the 

 Orenoco below its junction with the Casiquiare. He describes it 

 as a tree of 30 or 40 feet in height, with slender branches, and 

 handsome, very highly scented, yellow flowers. He found the 

 number of folds of the corolla to vary from 22 to 26 ; I have 

 counted 28 in some flowers ; and in a loose corolla which he found 

 floating very far down the Eio Negro there are 35. 



Adrien de Jussieu (Ann. Sc. Nat. iii. 2. p. 227) states that, in 

 the bud he examined, he found a 5-celled ovary with three or four 

 pendulous ovules in each. In the flowers I have examined I find 

 six cells, corresponding to the six raised ribs of the base of the 

 style described by Desfontaines. The four pendulous ovules in 

 each cell are precisely as in Napoleona. 



There being no fruit with these specimens, they add but little 

 to what was already known as bearing on the much-disputed 

 question of the affinities of these plants. I cannot enter into 

 Jussieu's views of their proximity to Sapotacece ; but it appears to 

 me that everything confirms Lindley's views of their affinity with 

 Myrtacecd. Indeed if we include in that family the Barringtoniece 

 and Lecythidecd, we can scarcely exclude Asteranthos. The tendency 

 to the union of the petals and stamens in concentric rings may be 

 traced in several plants of the group. 



Monograph of the Eucalypti of Tropical Australia ; with an Ar- 

 rangement for the use of Colonists according to the Structure 

 of the Bark*. By Dr. Eeedikand Muellee, Government 

 Botanist, Victoria, Australia. Communicated by Dr. J. D. 

 Hookee,V.P.E.S., P.L.S, 



[Read February 18, 1858.] 



Conspectus Eucaltptoeum Austealij) iNTEETEOPiciE et 



SUBTE0PICJ3. 



I. Folia alterna, latitudine conspicvs longiora. 

 § 1. ValvcB prorsus exsertce. 



1. E. tereticornis. Operculum conico-subulatum. 



2. E. rostrata. Operculum hemisphaericum, rostratum. 



3. E. hrevifolia. Operculum hemisphaericum, muticum. 



* The accompanying MS. has been compared with the specimens from Dr. 

 Mueller and A. Cunningham in the Hookerian Herbarium, by Mr. Allan Black, 

 Curator of the Herbarium, who has added some habitats and notes. — J. D. H. 

 LINN. PEOC. — BOTANY. G 



