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XXII. On Acradenia, a new Genus of Diosmeæ. By RICHARD KIPPIST, Esq., Libr. L.S. 
Read June 1, 1852. 
THE plant to which I propose to call the attention of the Society this evening, is one of 
a highly interesting collection, formed in the neighbourhood of Macquarie Harbour, by 
the indefatigable Secretary of the Royal Society of Van Diemen’s Land, Mr. Joseph Mil- 
ligan, by whom, through the instrumentality of our lamented member, Mr. Bicheno, they 
were kindly presented to the Society. | 
It belongs to the Diosmeous section of Rutacee (Tribe Boronieæ), and in habit most 
nearly approaches Zieria, to the larger-leaved species of which it bears, at first sight, con- . 
siderable resemblance. From this genus, however, as well as from Melicope, Boronia, 
and Cyanothamnus, it is readily distinguished by the quinary division of the parts of the 
flower, and by its more numerous stamens. From Eriostemon, Crowea, and Philotheca, 
with which it agrees in the number of its floral organs, it differs in having perfectly 
glabrous filaments, and smooth inappendiculate anthers; and from the latter genus, 
in addition, by the filaments being distinct, not, as in Philotheca, united below into 
a tube. ! 
Another genus of Australian Diosmeæ with which it accords very nearly in many of its 
artificial characters, is Geleznovia, a remarkable plant with the general aspect of Erio- 
stemon, recently described by Turezaninow, from Drummond's Swan River Collections, in 
the Bulletin of the Imperial Society of Naturalists at Moscow. The points of agreement 
are, the quinary division of the calyx and corolla, the smooth subulate stamens (ten in 
number), and glabrous inappendiculate anthers; but the calyx in Geleznovia is coloured, 
and as long, or rather longer, than the corolla, the anthers are strietly terminal, and the 
entire surface of the carpels is covered with elevated tubercles, each surmounted by a tuft 
of radiating hairs. imos 
From all the above-mentioned genera the Tasmanian plant is distinguished by the 
structure of its ovaries, which adhere closely together, and are everywhere clothed with a 
dense tomentose covering; except that each bears, at its upper external angle, a naked 
sessile tubercle or gland, large enough to be readily observed with the naked ey e; a cha- 
racter which I have been unable to discover in any closely allied genus, and a has con- 
sequently suggested the name Acradenia, by which I would propose to designate my 
lant. : 
R I am unable to speak positively as to the precise nature of these glandular ges or 
to say whether any exudation proceeds from them : when — under t " ee 
scope, they appear to be perforated by a tube, widening below, and nn ing “ss 
the internal cavity of the carpel. From the exact correspondence in their position, how- 
ever, they are probably analogous to the cornute appendages which crown the ovaries of 
