112 
The arrangement of the genera in the following list differs in a few 
particulars from that adopted in Bentham and Hooker's Genera Plan- 
tarum. The principal difference consists in the maiin of the 
Taxacee as a distinct order as originally proposed by Richard and 
followed by "Radiieher, Lindley, and many other botanists. This 
arrangement permits of a more natural arrangement of the several 
taxaceous genera under two tribes, the Salisburinee comprising Ginkgo, 
Cephalotaxus, and Torreya, and the Tazxinee including the two suh- 
tribes Taxee and Podocarpee. Prumno pitys, Philippi (with which 
Stachycarpus, Van Tieghem, is five) is placed by Bentham and 
Hooker under Podocarpus, but the combination of morphological and 
iiobis characters points to the desirability of maintaining it as a 
Wind Linie 
the Conifere or Pinacee proper a few changes have been 
made front the stout of Bentham and Hooker in accordance with 
the fuller knowlege of certain points er structure that is now available. 
Tetraclinis is proposed as a distinct genus, represented by the North 
African Callitris quadrivalvis, on the ground of its structure and 
geographical distribution. Widdringtonia is separated from Callitris 
for similar reasons. 
The sub-divisions of Cupressus and of Thuya have been bandied 
about between the two genera. ‘The genus Cupressus, as here under- 
stood, includes the Cypresses proper and the so- called flat Cypresses 
(Cha amecyparis), which Bentham and Hooker place under Thuya, and 
which others prefer to consider as a separate genus. etinispora, it is 
western American Thuiopsis, placed under Thuya by Bentham and 
Hooker, is more like a Cupressus, whilst the Sapelices plant, known 
under the same e generi? name, is a true Thuya. aT the fusion of 
Cupressus and Thuya into one genus would be the most natural 
steh a grouping and 
the consequent confusion of the nomenclature would be «almost 
intolerable. 
Pseudolarix of Gordon is shown by the male flowers to constitute a 
distinct genus, as was indeed suspected by Bentham. 
ceteleeria of Carriére, referred by Bentham to Abies, is also shown 
by the fuller knowledge we now have of its structure to constitute a 
distinct genus. 
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The collections of Conifere at Kew have occupied three different 
positions at successive times. According to John Smith’s eee! 
. 25 rbore of 
about five acres. It lay between the Temple of the Sun and the Bien: 
Main Entrance. It was laid out by W. Aiton on the Linnean system. 
* Pinus occupied the north and part of the east.” 
In the first edition of the Hortus Kewensis (1789) Aiton enumerates 
36 species of Conifere as cultivated a t Kew; in the second edition 
(1813) 56 species are recorded, which formed "the collection ig the 
original Arboretum.” Some of ion still remain. According to Smith 
(p. 286), “within a few yards of the entrance gates on Kew Green 
ae a specimen of P. Laricio (the Corsican Pine). In 1825 the late 
R. A. Salisbury informed me that he brought it from the south of 
France in the year 1814; it is now (1880) 85 feet high, and the most 
conspicuous tree in the Garden 
|. Ginkgo biloba Spent adiantifoli a), first introduced in 1754, ms 
according to Smith (p. 267), “ originally trained against a wall like 
fruit tree ; upon the wall being taken down, and the branches cut aw sai 
