12 
proper and the so-called flat Cypresses {Chamcecy parts), 
which Bentham and Hooker place under Thuya, and 
which others prefer to consider as a separate genus. 
Retinispora, it is now well known, has no claim to a 
separate generic position. The North-Western American 
Thuiopsis, placed under Thuya by Bentham and Hooker, 
is more like a Cupressus, whilst the Japanese plant 
known under the same generic name is a true Thuya, 
Probably the fusion of Cupressus and Thuya into one 
genus would be the most natural arrangement, but in 
practice the inconvenience of such 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. 
Keteleeria of Carri&re, referred by Bentham to Abies, 
is also shown by the fuller knowledge we now have of 
its structure to constitute a distinct genus.” 
The collections of Couiferce at Kew have occupied 
three different positions at successive times. According 
to John Smith’s privately printed Records of Kew (p. 
258), the original Arboretum consisted of about five 
acres. It lay between the Temple of the Sun and the 
present 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 Coniferce as cultivated 
at Kew ; in the second edition (1813) 56 species are 
